Solve for d
d=7
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702=18\times 11+9\left(9-1\right)d
Multiply both sides of the equation by 2.
702=198+9\left(9-1\right)d
Multiply 18 and 11 to get 198.
702=198+9\times 8d
Subtract 1 from 9 to get 8.
702=198+72d
Multiply 9 and 8 to get 72.
198+72d=702
Swap sides so that all variable terms are on the left hand side.
72d=702-198
Subtract 198 from both sides.
72d=504
Subtract 198 from 702 to get 504.
d=\frac{504}{72}
Divide both sides by 72.
d=7
Divide 504 by 72 to get 7.
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