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a+15+2a-17+a+15=180
We move all terms to the left:
a+15+2a-17+a+15-(180)=0
We add all the numbers together, and all the variables
4a-167=0
We move all terms containing a to the left, all other terms to the right
4a=167
a=167/4
a=41+3/4
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