3a+30=a+40

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Solution for 3a+30=a+40 equation: 



3a+30=a+40

We move all terms to the left:

3a+30-(a+40)=0

We get rid of parentheses

3a-a-40+30=0

We add all the numbers together, and all the variables

2a-10=0

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

2a=10

a=10/2

a=5

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