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x in (-oo:+oo)
(-4/5)*x+4/5 = 4/15 // - 4/15
(-4/5)*x+4/5-(4/15) = 0
(-4/5)*x+4/5-4/15 = 0
8/15-4/5*x = 0 // - 8/15
-4/5*x = -8/15 // : -4/5
x = -8/15/(-4/5)
x = 2/3
x = 2/3
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