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21.20m+0.25=12.95
We move all terms to the left:
21.20m+0.25-(12.95)=0
We add all the numbers together, and all the variables
21.20m-12.7=0
We move all terms containing m to the left, all other terms to the right
21.20m=12.7
m=12.7/21.20
m=3.4324324324324/5.7297297297297
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