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x in (-oo:+oo)
(5*x)/3-(2*x) = x-15 // - x-15
(5*x)/3-(2*x)-x+15 = 0
(5*x)/3-2*x-x+15 = 0
15-4/3*x = 0 // - 15
-4/3*x = -15 // : -4/3
x = -15/(-4/3)
x = 45/4
x = 45/4
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