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(1/4)*(12*x-8) = 7 // - 7
(1/4)*(12*x-8)-7 = 0
1/4*(12*x-8)-7 = 0
1/4*(12*x-8)-7 = 0
3*x-9 = 0
3*x-9 = 0
3*x-9 = 0 // + 9
3*x = 9 // : 3
x = 9/3
x = 3
x = 3
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