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(1/2)*(12*x-6)-x-4 = 0
1/2*(12*x-6)-x-4 = 0
1/2*(12*x-6)-x-4 = 0
5*x-4-3 = 0
5*x-7 = 0
5*x-7 = 0
5*x-7 = 0 // + 7
5*x = 7 // : 5
x = 7/5
x = 7/5
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