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x in (-oo:+oo)
(-4/5)*x = -12/25 // + -12/25
(-4/5)*x-(-12/25) = 0
(-4/5)*x+12/25 = 0
12/25-4/5*x = 0 // - 12/25
-4/5*x = -12/25 // : -4/5
x = -12/25/(-4/5)
x = 3/5
x = 3/5
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