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