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x in (-oo:+oo)
4-((1/5)*x) = 20 // - 20
4-((1/5)*x)-20 = 0
(-1/5)*x-20+4 = 0
-1/5*x-16 = 0 // + 16
-1/5*x = 16 // : -1/5
x = 16/(-1/5)
x = -80
x = -80
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