# What is the solution of 3x + 6 7x

2.1 | 6x (2x - 6) = 72 + 12x^{2} | solution6x (2x - 6) = 72 + 12x ^{2}12x ^{2} - 36x = 72 + 12x^{2} | - 12x^{2}-36x = 72 | : (-36) x = -2 L = {-2} | Forum | ||

2.2 | (x + 4) 2x - 12 = 0.5x (6 + 4x) | solution(x + 4) 2x - 12 = 0.5x (6 + 4x) 2x ^{2} + 8x - 12 = 3x + 2x^{2} | - 2x^{2}8x - 12 = 3x | - 3x 5x - 12 = 0 | + 12 5x = 12 | : 5 x = 2.4 L = {2.4} | Forum | ||

2.3 | 1.5x * (3x + 6) - 3x * (4 + 1.5x) = -7.5 | solution1.5x * (3x + 6) - 3x * (4 + 1.5x) = -7.5 4.5x ^{2} + 9x - 12 - 4.5x^{2} = -7,59x - 12 = -7.5 | + 12 9x = 4.5 | : 9 x = 0.5 L = {0.5} | Forum | ||

2.4 | 2 (2x - 5) 3x - 4x (3x + 2.5) + 10 = 0 | solution2 (2x - 5) 3x - 4x (3x + 2.5) + 10 = 0 12x ^{2} - 30x - 12x^{2} - 10x + 10 = 0 -40x + 10 = 0 | - 10 -40x = -10 | : (-40) x = 0.25 L = {0.25} | Forum | ||

2.5 | (5x - 7) 2x + x^{2} - 12 = 4x (3 + 2x) + 3 (x^{2} – 4) | solution(5x - 7) 2x + x ^{2} - 12 = 4x (3 + 2x) + 3 (x^{2} – 4)10x ^{2} - 14x + x^{2} - 12 = 12x + 8x^{2} + 3x^{2} – 12^{2} - 14x - 12 =^{2} + 12x - 12-14x - 12 = 12x - 12 | - 12x -26x - 12 = -12 | + 12 -26x = 0 | : (-26) x = 0 L = {0} | Forum | ||

2.6 | 1.4x (x + 3) - 6 (x + 0.2) = 2x (3.2 + 0.7x) - 8.2x + 3 | solution1.4x (x + 3) - 6 (x + 0.2) = 2x (3.2 + 0.7x) - 8.2x + 3 1.4x ^{2} + 4.2x - 6x - 1.2 = 6.4x + 1.4x^{2} - 8.2x1.4x ^{2} - 1.8x - 1.2 = 1.4x^{2} - 1.8x | - 1.4x^{2}-1.8x - 1.2 = -1.8x | + 1.8x -1.2 = 0 L = {} | Forum | ||

2.7 | 5x * (3x - 4) + 2 * (4x + 5) = (4x - 6) * 3x + 3x^{2} + 40 | solution5x * (3x - 4) + 2 * (4x + 5) = (4x - 6) * 3x + 3x ^{2} + 4015x ^{2} - 20x + 8x + 10 = 12x^{2} - 18x + 3x^{2} + 4015x ^{2} - 12x + 10 = 15x^{2} - 18x + 40 | -15x^{2} + 18x6x + 10 = 40 | - 10 6x = 30 | : 6 x = 5 L = {5} | Forum |

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