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