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Let's try one.
30x2y3z4 - 42x4y5z2
Do the numbers first.
Factor them.
2 x 3 x 5 = 30
2 x 3 x 7 = 42
Combine the factors, eliminating duplicates.
2 x 3 x 5 x 7 = 210
For the variables, select the highest exponent.
The LCM of the above expression is 210x4y5z4
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