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