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(1/2)*(2*x-6) = -6 // + 6
(1/2)*(2*x-6)+6 = 0
1/2*(2*x-6)+6 = 0
1/2*(2*x-6)+6 = 0
x+3 = 0
x+3 = 0
x+3 = 0 // - 3
x = -3
x = -3
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