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x in (-oo:+oo)
-((1/2)*x)-7 = 7 // - 7
-((1/2)*x)-7-7 = 0
(-1/2)*x-7-7 = 0
-1/2*x-14 = 0 // + 14
-1/2*x = 14 // : -1/2
x = 14/(-1/2)
x = -28
x = -28
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