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-9/4 = (-5/4)*x // - (-5/4)*x
-((-5/4)*x)-9/4 = 0
(5/4)*x-9/4 = 0
5/4*x-9/4 = 0 // + 9/4
5/4*x = 9/4 // : 5/4
x = 9/4/5/4
x = 9/5
x = 9/5
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