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(5/2)*x+3 = (1/2)*x+15 // - (1/2)*x+15
(5/2)*x-((1/2)*x)-15+3 = 0
(5/2)*x+(-1/2)*x-15+3 = 0
2*x-12 = 0 // + 12
2*x = 12 // : 2
x = 12/2
x = 6
x = 6
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