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x in (-oo:+oo)
(4/5)*x = -2/3 // + -2/3
(4/5)*x-(-2/3) = 0
(4/5)*x+2/3 = 0
4/5*x+2/3 = 0 // - 2/3
4/5*x = -2/3 // : 4/5
x = -2/3/4/5
x = -5/6
x = -5/6
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