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x in (-oo:+oo)
(-4/5)*x = 25/4 // - 25/4
(-4/5)*x-(25/4) = 0
(-4/5)*x-25/4 = 0
-4/5*x-25/4 = 0 // + 25/4
-4/5*x = 25/4 // : -4/5
x = 25/4/(-4/5)
x = -125/16
x = -125/16
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