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12*x-(8/4) = -x/2 // + -x/2
12*x-(-x/2)-(8/4) = 0
12*x+(1/2)*x-2 = 0
25/2*x-2 = 0 // + 2
25/2*x = 2 // : 25/2
x = 2/25/2
x = 4/25
x = 4/25
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