7.8+2.1m=97.8-0.9m

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Solution for 7.8+2.1m=97.8-0.9m equation: 



7.8+2.1m=97.8-0.9m

We move all terms to the left:

7.8+2.1m-(97.8-0.9m)=0

We add all the numbers together, and all the variables

2.1m-(-0.9m+97.8)+7.8=0

We get rid of parentheses

2.1m+0.9m-97.8+7.8=0

We add all the numbers together, and all the variables

3m-90=0

We move all terms containing m to the left, all other terms to the right

3m=90

m=90/3

m=30

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