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x in (-oo:+oo)
45 = (-9/8)*x // - (-9/8)*x
45-((-9/8)*x) = 0
(9/8)*x+45 = 0
9/8*x+45 = 0 // - 45
9/8*x = -45 // : 9/8
x = -45/9/8
x = -40
x = -40
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