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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-3044=0
We move all terms containing a to the left, all other terms to the right
12a=3044
a=3044/12
a=253+2/3
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