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n in (-oo:+oo)
(n-7)/8+(n-7)/9 = 5/36 // - 5/36
(n-7)/8+(n-7)/9-(5/36) = 0
(n-7)/8+(n-7)/9-5/36 = 0
(9*36*(n-7))/(8*9*36)+(8*36*(n-7))/(8*9*36)+(-5*8*9)/(8*9*36) = 0
9*36*(n-7)+8*36*(n-7)-5*8*9 = 0
612*n-4284-360 = 0
612*n-4644 = 0
(612*n-4644)/(8*9*36) = 0
(612*n-4644)/(8*9*36) = 0 // * 8*9*36
612*n-4644 = 0
612*n-4644 = 0 // + 4644
612*n = 4644 // : 612
n = 4644/612
n = 129/17
n = 129/17
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