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2*(3*x-7) = -20 // + 20
2*(3*x-7)+20 = 0
2*(3*x-7)+20 = 0
6*x+6 = 0
6*x+6 = 0
6*x+6 = 0 // - 6
6*x = -6 // : 6
x = -6/6
x = -1
x = -1
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