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x in (-oo:+oo)
-23 = 7*x-x+1 // - 7*x-x+1
x-(7*x)-23-1 = 0
x-7*x-23-1 = 0
-6*x-24 = 0 // + 24
-6*x = 24 // : -6
x = 24/(-6)
x = -4
x = -4
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