a=40-3a

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Solution for a=40-3a equation: 



a=40-3a

We move all terms to the left:

a-(40-3a)=0

We add all the numbers together, and all the variables

a-(-3a+40)=0

We get rid of parentheses

a+3a-40=0

We add all the numbers together, and all the variables

4a-40=0

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

4a=40

a=40/4

a=10

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