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a-10+3a-20+4a-10=180
We move all terms to the left:
a-10+3a-20+4a-10-(180)=0
We add all the numbers together, and all the variables
8a-220=0
We move all terms containing a to the left, all other terms to the right
8a=220
a=220/8
a=27+1/2
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