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(1/4)*(8*x-12) = 3 // - 3
(1/4)*(8*x-12)-3 = 0
1/4*(8*x-12)-3 = 0
1/4*(8*x-12)-3 = 0
2*x-6 = 0
2*x-6 = 0
2*x-6 = 0 // + 6
2*x = 6 // : 2
x = 6/2
x = 3
x = 3
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