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x in (-oo:+oo)
1-((1/5)*x) = 12 // - 12
1-((1/5)*x)-12 = 0
(-1/5)*x-12+1 = 0
-1/5*x-11 = 0 // + 11
-1/5*x = 11 // : -1/5
x = 11/(-1/5)
x = -55
x = -55
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