Solve for b
b=\frac{N-11x}{2}
Solve for N
N=11x+2b
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N=2b+11x
Combine 10x and x to get 11x.
2b+11x=N
Swap sides so that all variable terms are on the left hand side.
2b=N-11x
Subtract 11x from both sides.
\frac{2b}{2}=\frac{N-11x}{2}
Divide both sides by 2.
b=\frac{N-11x}{2}
Dividing by 2 undoes the multiplication by 2.
N=2b+11x
Combine 10x and x to get 11x.
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