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(1/2)*(2*x-10) = 7 // - 7
(1/2)*(2*x-10)-7 = 0
1/2*(2*x-10)-7 = 0
1/2*(2*x-10)-7 = 0
x-12 = 0
x-12 = 0
x-12 = 0 // + 12
x = 12
x = 12
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