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