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5a+18+254-a+8a-30=180
We move all terms to the left:
5a+18+254-a+8a-30-(180)=0
We add all the numbers together, and all the variables
12a+62=0
We move all terms containing a to the left, all other terms to the right
12a=-62
a=-62/12
a=-5+1/6
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