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(1/2)*(12*x+2)+4*x = 3 // - 3
(1/2)*(12*x+2)+4*x-3 = 0
1/2*(12*x+2)+4*x-3 = 0
1/2*(12*x+2)+4*x-3 = 0
10*x-3+1 = 0
10*x-2 = 0
10*x-2 = 0
10*x-2 = 0 // + 2
10*x = 2 // : 10
x = 2/10
x = 1/5
x = 1/5
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