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x in (-oo:+oo)
(2/3)*x = 4*x+10 // - 4*x+10
(2/3)*x-(4*x)-10 = 0
(2/3)*x-4*x-10 = 0
-10/3*x-10 = 0 // + 10
-10/3*x = 10 // : -10/3
x = 10/(-10/3)
x = -3
x = -3
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