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18 = (5/8)*x // - (5/8)*x
18-((5/8)*x) = 0
(-5/8)*x+18 = 0
18-5/8*x = 0 // - 18
-5/8*x = -18 // : -5/8
x = -18/(-5/8)
x = 144/5
x = 144/5
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