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x in (-oo:+oo)
(-2/4)*x+3 = 9 // - 9
(-2/4)*x-9+3 = 0
-1/2*x-6 = 0 // + 6
-1/2*x = 6 // : -1/2
x = 6/(-1/2)
x = -12
x = -12
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