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5/2 = (15/4)*x+3 // - (15/4)*x+3
5/2-((15/4)*x)-3 = 0
(-15/4)*x+5/2-3 = 0
-15/4*x-1/2 = 0 // + 1/2
-15/4*x = 1/2 // : -15/4
x = 1/2/(-15/4)
x = -2/15
x = -2/15
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