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x in (-oo:+oo)
(-1/3)*x+27 = 9-x // - 9-x
(-1/3)*x+x-9+27 = 0
2/3*x+18 = 0 // - 18
2/3*x = -18 // : 2/3
x = -18/2/3
x = -27
x = -27
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