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x in (-oo:+oo)
(-4/5)*x = 2/10 // - 2/10
(-4/5)*x-(2/10) = 0
(-4/5)*x-1/5 = 0
-4/5*x-1/5 = 0 // + 1/5
-4/5*x = 1/5 // : -4/5
x = 1/5/(-4/5)
x = -1/4
x = -1/4
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