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(4/5)*x-x = (7/8)*x-5 // - (7/8)*x-5
(4/5)*x-x-((7/8)*x)+5 = 0
(4/5)*x-x+(-7/8)*x+5 = 0
5-43/40*x = 0 // - 5
-43/40*x = -5 // : -43/40
x = -5/(-43/40)
x = 200/43
x = 200/43
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