3a+9=2a-1

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Solution for 3a+9=2a-1 equation: 



3a+9=2a-1

We move all terms to the left:

3a+9-(2a-1)=0

We get rid of parentheses

3a-2a+1+9=0

We add all the numbers together, and all the variables

a+10=0

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

a=-10

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