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x in (-oo:+oo)
(-4/5)*x+1 = -19/5 // + -19/5
(-4/5)*x-(-19/5)+1 = 0
(-4/5)*x+19/5+1 = 0
24/5-4/5*x = 0 // - 24/5
-4/5*x = -24/5 // : -4/5
x = -24/5/(-4/5)
x = 6
x = 6
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