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