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