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(1/4)*(28*x-12)-x-6 = 0
1/4*(28*x-12)-x-6 = 0
1/4*(28*x-12)-x-6 = 0
6*x-6-3 = 0
6*x-9 = 0
6*x-9 = 0
6*x-9 = 0 // + 9
6*x = 9 // : 6
x = 9/6
x = 3/2
x = 3/2
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