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x in (-oo:+oo)
(-1/5)*x-1 = 12 // - 12
(-1/5)*x-12-1 = 0
-1/5*x-13 = 0 // + 13
-1/5*x = 13 // : -1/5
x = 13/(-1/5)
x = -65
x = -65
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