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n in (-oo:+oo)
(n-11)/4+(n+4)/9 = 17/18 // - 17/18
(n-11)/4+(n+4)/9-(17/18) = 0
(n-11)/4+(n+4)/9-17/18 = 0
(9*18*(n-11))/(4*9*18)+(4*18*(n+4))/(4*9*18)+(-17*4*9)/(4*9*18) = 0
9*18*(n-11)+4*18*(n+4)-17*4*9 = 0
234*n-1494-612 = 0
234*n-2106 = 0
(234*n-2106)/(4*9*18) = 0
(234*n-2106)/(4*9*18) = 0 // * 4*9*18
234*n-2106 = 0
234*n-2106 = 0 // + 2106
234*n = 2106 // : 234
n = 2106/234
n = 9
n = 9
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