Solve for b
b=6
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4062240-2013\times 2018=b
Multiply 2015 and 2016 to get 4062240.
4062240-4062234=b
Multiply 2013 and 2018 to get 4062234.
6=b
Subtract 4062234 from 4062240 to get 6.
b=6
Swap sides so that all variable terms are on the left hand side.
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