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x in (-oo:+oo)
(2/5)*x-4 = (3/5)*x // - (3/5)*x
(2/5)*x-((3/5)*x)-4 = 0
(2/5)*x+(-3/5)*x-4 = 0
-1/5*x-4 = 0 // + 4
-1/5*x = 4 // : -1/5
x = 4/(-1/5)
x = -20
x = -20
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