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x in (-oo:+oo)
(-1/3)*x+9 = 3-x // - 3-x
(-1/3)*x+x-3+9 = 0
2/3*x+6 = 0 // - 6
2/3*x = -6 // : 2/3
x = -6/2/3
x = -9
x = -9
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