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b in (-oo:+oo)
b/13-(36/13) = 8/3 // - 8/3
b/13-(36/13)-(8/3) = 0
b/13-36/13-8/3 = 0
1/13*b-212/39 = 0 // + 212/39
1/13*b = 212/39 // : 1/13
b = 212/39/1/13
b = 212/3
b = 212/3
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