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n in (-oo:+oo)
(2/9)*(28-4*n) = 88 // - 88
(2/9)*(28-4*n)-88 = 0
2/9*(28-4*n)-88 = 0
2/9*(28-4*n)-88 = 0
-8/9*n-736/9 = 0
-8/9*n-736/9 = 0
-8/9*n-736/9 = 0 // + 736/9
-8/9*n = 736/9 // : -8/9
n = 736/9/(-8/9)
n = -92
n = -92
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