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2a-18+3a-5+2a-19=180
We move all terms to the left:
2a-18+3a-5+2a-19-(180)=0
We add all the numbers together, and all the variables
7a-222=0
We move all terms containing a to the left, all other terms to the right
7a=222
a=222/7
a=31+5/7
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