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