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x in (-oo:+oo)
(1/5)*x-3 = (1/4)*x // - (1/4)*x
(1/5)*x-((1/4)*x)-3 = 0
(1/5)*x+(-1/4)*x-3 = 0
-1/20*x-3 = 0 // + 3
-1/20*x = 3 // : -1/20
x = 3/(-1/20)
x = -60
x = -60
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