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x in (-oo:+oo)
-((1/2)*x)-4 = 3 // - 3
-((1/2)*x)-4-3 = 0
(-1/2)*x-4-3 = 0
-1/2*x-7 = 0 // + 7
-1/2*x = 7 // : -1/2
x = 7/(-1/2)
x = -14
x = -14
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