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200+(a*12)=644
We move all terms to the left:
200+(a*12)-(644)=0
We add all the numbers together, and all the variables
(+a*12)+200-644=0
We add all the numbers together, and all the variables
(+a*12)-444=0
We get rid of parentheses
a*12-444=0
Wy multiply elements
12a-444=0
We move all terms containing a to the left, all other terms to the right
12a=444
a=444/12
a=37
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