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9*x-((11/8)*x)-7 = x-((4/8)*x)-7 // - x-((4/8)*x)-7
9*x-((11/8)*x)-x+(4/8)*x-7+7 = 0
9*x+(-11/8)*x-x+(4/8)*x-7+7 = 0
57/8*x = 0 // : 57/8
x = 0
x = 0
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