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