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