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