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12(a+200)=644
We move all terms to the left:
12(a+200)-(644)=0
We multiply parentheses
12a+2400-644=0
We add all the numbers together, and all the variables
12a+1756=0
We move all terms containing a to the left, all other terms to the right
12a=-1756
a=-1756/12
a=-146+1/3
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