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2b/b + 11/b = 15/2
(2b+11)/b=15/2
2(2b+11)=15b
4b+22=15b
22=15b-4b
22=11b
22/11=b
b=2
4b + 22 = 15b
4b - 15 b = - 22
-11 b = - 22
b = 2