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x in (-oo:+oo)
(3/4)*x = -4/5 // + -4/5
(3/4)*x-(-4/5) = 0
(3/4)*x+4/5 = 0
3/4*x+4/5 = 0 // - 4/5
3/4*x = -4/5 // : 3/4
x = -4/5/3/4
x = -16/15
x = -16/15
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