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x in (-oo:+oo)
(2/3)*x-(2*x) = 10 // - 10
(2/3)*x-(2*x)-10 = 0
(2/3)*x-2*x-10 = 0
-4/3*x-10 = 0 // + 10
-4/3*x = 10 // : -4/3
x = 10/(-4/3)
x = -15/2
x = -15/2
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