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x in (-oo:+oo)
x/3 = 2*x-45 // - 2*x-45
x/3-(2*x)+45 = 0
x/3-2*x+45 = 0
45-5/3*x = 0 // - 45
-5/3*x = -45 // : -5/3
x = -45/(-5/3)
x = 27
x = 27
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