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n in (-oo:+oo)
2*n-22 = n/4 // - n/4
2*n-(n/4)-22 = 0
7/4*n-22 = 0 // + 22
7/4*n = 22 // : 7/4
n = 22/7/4
n = 88/7
n = 88/7
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