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