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(1/2)*(2*x-4) = -10 // + 10
(1/2)*(2*x-4)+10 = 0
1/2*(2*x-4)+10 = 0
1/2*(2*x-4)+10 = 0
x+8 = 0
x+8 = 0
x+8 = 0 // - 8
x = -8
x = -8
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