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(1/2)*x+1/2-10-5 = 15 // - 15
(1/2)*x+1/2-15-10-5 = 0
1/2*x-59/2 = 0 // + 59/2
1/2*x = 59/2 // : 1/2
x = 59/2/1/2
x = 59
x = 59
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