4a+2a+a+40=180

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Solution for 4a+2a+a+40=180 equation: 



4a+2a+a+40=180

We move all terms to the left:

4a+2a+a+40-(180)=0

We add all the numbers together, and all the variables

7a-140=0

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

7a=140

a=140/7

a=20

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