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