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