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x in (-oo:+oo)
x/3-x+27 = 6 // - 6
x/3-x-6+27 = 0
21-2/3*x = 0 // - 21
-2/3*x = -21 // : -2/3
x = -21/(-2/3)
x = 63/2
x = 63/2
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