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x in (-oo:+oo)
6-((1/2)*x) = -1 // + 1
1-((1/2)*x)+6 = 0
(-1/2)*x+1+6 = 0
7-1/2*x = 0 // - 7
-1/2*x = -7 // : -1/2
x = -7/(-1/2)
x = 14
x = 14
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