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x in (-oo:+oo)
(4/5)*x-(2/3) = 3*x+1/2 // - 3*x+1/2
(4/5)*x-(3*x)-(2/3)-(1/2) = 0
(4/5)*x-3*x-2/3-1/2 = 0
-11/5*x-7/6 = 0 // + 7/6
-11/5*x = 7/6 // : -11/5
x = 7/6/(-11/5)
x = -35/66
x = -35/66
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