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x in (-oo:+oo)
(1/5)*x-((2/3)*x)-2 = (-2/5)*x // - (-2/5)*x
(1/5)*x-((2/3)*x)-((-2/5)*x)-2 = 0
(1/5)*x+(-2/3)*x+(2/5)*x-2 = 0
-1/15*x-2 = 0 // + 2
-1/15*x = 2 // : -1/15
x = 2/(-1/15)
x = -30
x = -30
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