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(1/2)*(4*x-12) = 5 // - 5
(1/2)*(4*x-12)-5 = 0
1/2*(4*x-12)-5 = 0
1/2*(4*x-12)-5 = 0
2*x-11 = 0
2*x-11 = 0
2*x-11 = 0 // + 11
2*x = 11 // : 2
x = 11/2
x = 11/2
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