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x in (-oo:+oo)
9/8 = (-3/4)*x // - (-3/4)*x
9/8-((-3/4)*x) = 0
(3/4)*x+9/8 = 0
3/4*x+9/8 = 0 // - 9/8
3/4*x = -9/8 // : 3/4
x = -9/8/3/4
x = -3/2
x = -3/2
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