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120+40m=180+20
We move all terms to the left:
120+40m-(180+20)=0
We add all the numbers together, and all the variables
40m+120-200=0
We add all the numbers together, and all the variables
40m-80=0
We move all terms containing m to the left, all other terms to the right
40m=80
m=80/40
m=2
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