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a+2+2a+4+2a+7=180
We move all terms to the left:
a+2+2a+4+2a+7-(180)=0
We add all the numbers together, and all the variables
5a-167=0
We move all terms containing a to the left, all other terms to the right
5a=167
a=167/5
a=33+2/5
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