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