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x in (-oo:+oo)
x/3-10 = 2*x // - 2*x
x/3-(2*x)-10 = 0
x/3-2*x-10 = 0
-5/3*x-10 = 0 // + 10
-5/3*x = 10 // : -5/3
x = 10/(-5/3)
x = -6
x = -6
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