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15\left(6\times 20+1\right)=90\times 20+15
Multiply both sides of the equation by 20.
15\left(120+1\right)=90\times 20+15
Multiply 6 and 20 to get 120.
15\times 121=90\times 20+15
Add 120 and 1 to get 121.
1815=90\times 20+15
Multiply 15 and 121 to get 1815.
1815=1800+15
Multiply 90 and 20 to get 1800.
1815=1815
Add 1800 and 15 to get 1815.
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Compare 1815 and 1815.
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