Solve for x
x=72900
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100\times 9\times 9\times 9=x
Multiply 10 and 10 to get 100.
900\times 9\times 9=x
Multiply 100 and 9 to get 900.
8100\times 9=x
Multiply 900 and 9 to get 8100.
72900=x
Multiply 8100 and 9 to get 72900.
x=72900
Swap sides so that all variable terms are on the left hand side.
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