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x in (-oo:+oo)
-100 = (-4/3)*x // - (-4/3)*x
-((-4/3)*x)-100 = 0
(4/3)*x-100 = 0
4/3*x-100 = 0 // + 100
4/3*x = 100 // : 4/3
x = 100/4/3
x = 75
x = 75
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