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b in (-oo:+oo)
b/36 = 5/9 // - 5/9
b/36-(5/9) = 0
b/36-5/9 = 0
1/36*b-5/9 = 0 // + 5/9
1/36*b = 5/9 // : 1/36
b = 5/9/1/36
b = 20
b = 20
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