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5/8 = (10/4)*x // - (10/4)*x
5/8-((10/4)*x) = 0
(-5/2)*x+5/8 = 0
5/8-5/2*x = 0 // - 5/8
-5/2*x = -5/8 // : -5/2
x = -5/8/(-5/2)
x = 1/4
x = 1/4
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