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52+3m+m+2m+3m=180
We move all terms to the left:
52+3m+m+2m+3m-(180)=0
We add all the numbers together, and all the variables
9m-128=0
We move all terms containing m to the left, all other terms to the right
9m=128
m=128/9
m=14+2/9
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