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55+12=1\times 60+7
Multiply both sides of the equation by 60, the least common multiple of 12,5,60.
67=1\times 60+7
Add 55 and 12 to get 67.
67=60+7
Multiply 1 and 60 to get 60.
67=67
Add 60 and 7 to get 67.
\text{true}
Compare 67 and 67.
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