Solve for b
b=-20
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1=\frac{7\times 9}{3}+b
Express \frac{7}{3}\times 9 as a single fraction.
1=\frac{63}{3}+b
Multiply 7 and 9 to get 63.
1=21+b
Divide 63 by 3 to get 21.
21+b=1
Swap sides so that all variable terms are on the left hand side.
b=1-21
Subtract 21 from both sides.
b=-20
Subtract 21 from 1 to get -20.
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