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