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