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x in (-oo:+oo)
16-((1/2)*x) = 4 // - 4
16-((1/2)*x)-4 = 0
(-1/2)*x-4+16 = 0
12-1/2*x = 0 // - 12
-1/2*x = -12 // : -1/2
x = -12/(-1/2)
x = 24
x = 24
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