Solve for b
b=31-m_{90}
Solve for m_90
m_{90}=31-b
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m_{90}+b=31
Swap sides so that all variable terms are on the left hand side.
b=31-m_{90}
Subtract m_{90} from both sides.
m_{90}+b=31
Swap sides so that all variable terms are on the left hand side.
m_{90}=31-b
Subtract b from both sides.
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