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a in (-oo:+oo)
a/36 = 6.5/13 // - 6.5/13
a/36-(6.5/13) = 0
a/36-0.5 = 0
1/36*a-0.5 = 0 // + 0.5
1/36*a = 0.5 // : 1/36
a = 0.5/1/36
a = 17.99999856
a = 17.99999856
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