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x in (-oo:+oo)
5-((1/2)*x)-3 = 4 // - 4
5-((1/2)*x)-4-3 = 0
(-1/2)*x-4-3+5 = 0
-1/2*x-2 = 0 // + 2
-1/2*x = 2 // : -1/2
x = 2/(-1/2)
x = -4
x = -4
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