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(1/2)*(x-6) = -7 // + 7
(1/2)*(x-6)+7 = 0
1/2*(x-6)+7 = 0
1/2*(x-6)+7 = 0
1/2*x+4 = 0
1/2*x+4 = 0
1/2*x+4 = 0 // - 4
1/2*x = -4 // : 1/2
x = -4/1/2
x = -8
x = -8
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