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x in (-oo:+oo)
4-((1/5)*x) = (1/5)*x // - (1/5)*x
4-((1/5)*x)-((1/5)*x) = 0
(-1/5)*x+(-1/5)*x+4 = 0
4-2/5*x = 0 // - 4
-2/5*x = -4 // : -2/5
x = -4/(-2/5)
x = 10
x = 10
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