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x in (-oo:+oo)
6 = (-3/4)*x // - (-3/4)*x
6-((-3/4)*x) = 0
(3/4)*x+6 = 0
3/4*x+6 = 0 // - 6
3/4*x = -6 // : 3/4
x = -6/3/4
x = -8
x = -8
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