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21\left(9\times 3+1\right)+7\times 18=54
Multiply both sides of the equation by 63, the least common multiple of 3,9,7.
21\left(27+1\right)+7\times 18=54
Multiply 9 and 3 to get 27.
21\times 28+7\times 18=54
Add 27 and 1 to get 28.
588+7\times 18=54
Multiply 21 and 28 to get 588.
588+126=54
Multiply 7 and 18 to get 126.
714=54
Add 588 and 126 to get 714.
\text{false}
Compare 714 and 54.
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