3a=a+40

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Solution for 3a=a+40 equation: 



3a=a+40

We move all terms to the left:

3a-(a+40)=0

We get rid of parentheses

3a-a-40=0

We add all the numbers together, and all the variables

2a-40=0

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

2a=40

a=40/2

a=20

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