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x in (-oo:+oo)
1-((1/5)*x) = 3 // - 3
1-((1/5)*x)-3 = 0
(-1/5)*x-3+1 = 0
-1/5*x-2 = 0 // + 2
-1/5*x = 2 // : -1/5
x = 2/(-1/5)
x = -10
x = -10
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