3a+4a=18-2a

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Solution for 3a+4a=18-2a equation: 



3a+4a=18-2a

We move all terms to the left:

3a+4a-(18-2a)=0

We add all the numbers together, and all the variables

3a+4a-(-2a+18)=0

We add all the numbers together, and all the variables

7a-(-2a+18)=0

We get rid of parentheses

7a+2a-18=0

We add all the numbers together, and all the variables

9a-18=0

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

9a=18

a=18/9

a=2

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