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x in (-oo:+oo)
x-(7*x)-6 = -6/5 // + -6/5
x-(7*x)-(-6/5)-6 = 0
x-7*x+6/5-6 = 0
-6*x-24/5 = 0 // + 24/5
-6*x = 24/5 // : -6
x = 24/5/(-6)
x = -4/5
x = -4/5
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