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x in (-oo:+oo)
x/6 = -5/7 // + -5/7
x/6-(-5/7) = 0
x/6+5/7 = 0
1/6*x+5/7 = 0 // - 5/7
1/6*x = -5/7 // : 1/6
x = -5/7/1/6
x = -30/7
x = -30/7
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