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x in (-oo:+oo)
(-4/5)*(x+1/5) = (4/5)*(x+1) // - (4/5)*(x+1)
(-4/5)*(x+1/5)-((4/5)*(x+1)) = 0
(-4/5)*(x+1/5)+(-4/5)*(x+1) = 0
-4/5*(x+1/5)-4/5*(x+1) = 0
-4/5*(x+1/5)-4/5*(x+1) = 0
-8/5*x-24/25 = 0
-8/5*x-24/25 = 0
-8/5*x-24/25 = 0 // + 24/25
-8/5*x = 24/25 // : -8/5
x = 24/25/(-8/5)
x = -3/5
x = -3/5
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