a+a+a+70+20=180

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Solution for a+a+a+70+20=180 equation: 



a+a+a+70+20=180

We move all terms to the left:

a+a+a+70+20-(180)=0

We add all the numbers together, and all the variables

3a-90=0

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

3a=90

a=90/3

a=30

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