a+40+a+20+10a=180

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Solution for a+40+a+20+10a=180 equation: 



a+40+a+20+10a=180

We move all terms to the left:

a+40+a+20+10a-(180)=0

We add all the numbers together, and all the variables

12a-120=0

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

12a=120

a=120/12

a=10

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