Solve for b
b=13
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11=\frac{-4}{2}+b
Express -\frac{1}{2}\times 4 as a single fraction.
11=-2+b
Divide -4 by 2 to get -2.
-2+b=11
Swap sides so that all variable terms are on the left hand side.
b=11+2
Add 2 to both sides.
b=13
Add 11 and 2 to get 13.
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