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(8/9)*x-((5/8)*x) = (15/16)*x-13 // - (15/16)*x-13
(8/9)*x-((5/8)*x)-((15/16)*x)+13 = 0
(8/9)*x+(-5/8)*x+(-15/16)*x+13 = 0
13-97/144*x = 0 // - 13
-97/144*x = -13 // : -97/144
x = -13/(-97/144)
x = 1872/97
x = 1872/97
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