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x in (-oo:+oo)
1/4-((1/2)*x) = 6 // - 6
1/4-((1/2)*x)-6 = 0
(-1/2)*x+1/4-6 = 0
-1/2*x-23/4 = 0 // + 23/4
-1/2*x = 23/4 // : -1/2
x = 23/4/(-1/2)
x = -23/2
x = -23/2
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