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