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9/10-((5/8)*x)-((1/10)*x)-(1/5) = 0
(-5/8)*x+(-1/10)*x+9/10-1/5 = 0
7/10-29/40*x = 0 // - 7/10
-29/40*x = -7/10 // : -29/40
x = -7/10/(-29/40)
x = 28/29
x = 28/29
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