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x in (-oo:+oo)
(4/5)*x-(2/3) = x+11/15 // - x+11/15
(4/5)*x-x-(2/3)-(11/15) = 0
(4/5)*x-x-2/3-11/15 = 0
-1/5*x-7/5 = 0 // + 7/5
-1/5*x = 7/5 // : -1/5
x = 7/5/(-1/5)
x = -7
x = -7
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