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(1/2)*x-31.5 = -25 // + 25
(1/2)*x-31.5+25 = 0
1/2*x-6.5 = 0 // + 6.5
1/2*x = 6.5 // : 1/2
x = 6.5/1/2
x = 13
x = 13
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