8a-28+a+19=180

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Solution for 8a-28+a+19=180 equation: 



8a-28+a+19=180

We move all terms to the left:

8a-28+a+19-(180)=0

We add all the numbers together, and all the variables

9a-189=0

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

9a=189

a=189/9

a=21

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