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