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n in (-oo:+oo)
n/36 = 1/4 // - 1/4
n/36-(1/4) = 0
n/36-1/4 = 0
1/36*n-1/4 = 0 // + 1/4
1/36*n = 1/4 // : 1/36
n = 1/4/1/36
n = 9
n = 9
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