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(799+245)*2=a
We move all terms to the left:
(799+245)*2-(a)=0
We add all the numbers together, and all the variables
-a+1044*2=0
We add all the numbers together, and all the variables
-1a+2088=0
We move all terms containing a to the left, all other terms to the right
-a=-2088
a=-2088/-1
a=+2088
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