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x in (-oo:+oo)
x/7 = -5/6 // + -5/6
x/7-(-5/6) = 0
x/7+5/6 = 0
1/7*x+5/6 = 0 // - 5/6
1/7*x = -5/6 // : 1/7
x = -5/6/1/7
x = -35/6
x = -35/6
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