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x in (-oo:+oo)
(-5/6)*x = -6/7 // + -6/7
(-5/6)*x-(-6/7) = 0
(-5/6)*x+6/7 = 0
6/7-5/6*x = 0 // - 6/7
-5/6*x = -6/7 // : -5/6
x = -6/7/(-5/6)
x = 36/35
x = 36/35
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