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x in (-oo:+oo)
-x/5-((2/5)*x) = 2 // - 2
-x/5-((2/5)*x)-2 = 0
(-2/5)*x-x/5-2 = 0
-3/5*x-2 = 0 // + 2
-3/5*x = 2 // : -3/5
x = 2/(-3/5)
x = -10/3
x = -10/3
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