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x in (-oo:+oo)
x/(-2)+3 = -6*(-2) // + -6*(-2)
x/(-2)-(-6*(-2))+3 = 0
x/(-2)-12+3 = 0
-1/2*x-9 = 0 // + 9
-1/2*x = 9 // : -1/2
x = 9/(-1/2)
x = -18
x = -18
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