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3*(4*x+10) = 126 // - 126
3*(4*x+10)-126 = 0
3*(4*x+10)-126 = 0
12*x-96 = 0
12*x-96 = 0
12*x-96 = 0 // + 96
12*x = 96 // : 12
x = 96/12
x = 8
x = 8
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