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(5/2)*x+3 = x+15/2 // - x+15/2
(5/2)*x-x-(15/2)+3 = 0
(5/2)*x-x-15/2+3 = 0
3/2*x-9/2 = 0 // + 9/2
3/2*x = 9/2 // : 3/2
x = 9/2/3/2
x = 3
x = 3
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