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n in (-oo:+oo)
(5/36)*n-((1/18)*n)-15 = 0
(5/36)*n+(-1/18)*n-15 = 0
1/12*n-15 = 0 // + 15
1/12*n = 15 // : 1/12
n = 15/1/12
n = 180
n = 180
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