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