This might help you express your equations more clearly.
2/3 = 11/(8+b)
Multiply both sides by 8+b and 3.
16 + 2b = 33
Subtract 16 from both sides.
2b = 17
However, it might also be:
2/3 = 11/8 + b
Multiply both sides by 24.
16 = 33 + b
Subtract 33 from both sides.
-17 = b
2 over 3 = 11 over 8 +b
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