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(-7/8)*x+9 = (4/5)*x-17 // - (4/5)*x-17
(-7/8)*x-((4/5)*x)+9+17 = 0
(-7/8)*x+(-4/5)*x+9+17 = 0
26-67/40*x = 0 // - 26
-67/40*x = -26 // : -67/40
x = -26/(-67/40)
x = 1040/67
x = 1040/67
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