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2a-40+2a+a+33+a-15+a-20+2a-48=2520
We move all terms to the left:
2a-40+2a+a+33+a-15+a-20+2a-48-(2520)=0
We add all the numbers together, and all the variables
9a-2610=0
We move all terms containing a to the left, all other terms to the right
9a=2610
a=2610/9
a=290
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