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x in (-oo:+oo)
x-((1*(x/2))/2) = 27 // - 27
x-((1*(x/2))/2)-27 = 0
x+(-1/4)*x-27 = 0
3/4*x-27 = 0 // + 27
3/4*x = 27 // : 3/4
x = 27/3/4
x = 36
x = 36
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