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9-((5/8)*x)-((1/10)*x)-1 = 0
(-5/8)*x+(-1/10)*x-1+9 = 0
8-29/40*x = 0 // - 8
-29/40*x = -8 // : -29/40
x = -8/(-29/40)
x = 320/29
x = 320/29
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