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x in (-oo:+oo)
3 = -x/6 // + -x/6
3-(-x/6) = 0
(1/6)*x+3 = 0
1/6*x+3 = 0 // - 3
1/6*x = -3 // : 1/6
x = -3/1/6
x = -18
x = -18
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