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x in (-oo:+oo)
(5/6)*x = -2/8 // + -2/8
(5/6)*x-(-2/8) = 0
(5/6)*x+1/4 = 0
5/6*x+1/4 = 0 // - 1/4
5/6*x = -1/4 // : 5/6
x = -1/4/5/6
x = -3/10
x = -3/10
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