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n in (-oo:+oo)
n/36 = 7.5 // - 7.5
n/36-7.5 = 0
1/36*n-7.5 = 0 // + 7.5
1/36*n = 7.5 // : 1/36
n = 7.5/1/36
n = 269.9999784
n = 269.9999784
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