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(3/4)*(4*x-12) = 6 // - 6
(3/4)*(4*x-12)-6 = 0
3/4*(4*x-12)-6 = 0
3/4*(4*x-12)-6 = 0
3*x-15 = 0
3*x-15 = 0
3*x-15 = 0 // + 15
3*x = 15 // : 3
x = 15/3
x = 5
x = 5
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