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(5/2)*x+3 = (1/2)*x-8 // - (1/2)*x-8
(5/2)*x-((1/2)*x)+3+8 = 0
(5/2)*x+(-1/2)*x+3+8 = 0
2*x+11 = 0 // - 11
2*x = -11 // : 2
x = -11/2
x = -11/2
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