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20+2mm=8.
We move all terms to the left:
20+2mm-(8.)=0
We add all the numbers together, and all the variables
2mm+20-8=0
We add all the numbers together, and all the variables
2mm+12=0
We move all terms containing m to the left, all other terms to the right
2mm=-12
m=-12/1
m=-12
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