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(1/2)*(2*x-6) = -(4*x)-18 // + -(4*x)-18
(1/2)*(2*x-6)+4*x+18 = 0
1/2*(2*x-6)+4*x+18 = 0
1/2*(2*x-6)+4*x+18 = 0
5*x-3+18 = 0
5*x+15 = 0
5*x+15 = 0
5*x+15 = 0 // - 15
5*x = -15 // : 5
x = -15/5
x = -3
x = -3
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