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n in (-oo:+oo)
(3/8)*(n+11) = 51 // - 51
(3/8)*(n+11)-51 = 0
3/8*(n+11)-51 = 0
3/8*(n+11)-51 = 0
3/8*n-375/8 = 0
3/8*n-375/8 = 0
3/8*n-375/8 = 0 // + 375/8
3/8*n = 375/8 // : 3/8
n = 375/8/3/8
n = 125
n = 125
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