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x in (-oo:+oo)
1/5 = (-3/4)*x // - (-3/4)*x
1/5-((-3/4)*x) = 0
(3/4)*x+1/5 = 0
3/4*x+1/5 = 0 // - 1/5
3/4*x = -1/5 // : 3/4
x = -1/5/3/4
x = -4/15
x = -4/15
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