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3(2x + 7) = 5(x - 4)
6x + 21 = 5x - 20
6x - 5x +21 = 5x - 5x -20
x+21 = -20
x + 21-21 = -20 - 21
x = -41
2(5x - 6 ) = 3 ( 3x -7)
10x - 12 = 9x - 21
10x - 9x-12 = 9x-9x-21
x-12 = -21
x-12+12 = -21+12
x = -9