It equals a nonsense.
Some of the measures are areas in 2-dimensional space while others are measure of volume in 3-dimensional space. According to basic principles of dimensional analysis, combining them together is not valid.
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(3+2) (4+48)
Identify the law illustrated by: 12m + 0 is the same as 12m.
12m + 9n - 4 - 10m + 6n = 2m + 15n - 4
It is: 12 meters = 1200 centimeters
3M x x 4M = 12M^2