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120\times 420=100\times 12\times 42
Multiply both sides of the equation by 100.
50400=100\times 12\times 42
Multiply 120 and 420 to get 50400.
50400=1200\times 42
Multiply 100 and 12 to get 1200.
50400=50400
Multiply 1200 and 42 to get 50400.
\text{true}
Compare 50400 and 50400.
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