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