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