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n in (-oo:+oo)
(4/5)*(n-10) = -8/9 // + -8/9
(4/5)*(n-10)-(-8/9) = 0
(4/5)*(n-10)+8/9 = 0
4/5*(n-10)+8/9 = 0
(4/5*9*(n-10))/9+8/9 = 0
4/5*9*(n-10)+8 = 0
36/5*n-64 = 0
(36/5*n-64)/9 = 0
(36/5*n-64)/9 = 0 // * 9
36/5*n-64 = 0
36/5*n-64 = 0 // + 64
36/5*n = 64 // : 36/5
n = 64/36/5
n = 80/9
n = 80/9
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