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200/12=12a=644
We move all terms to the left:
200/12-(12a)=0
We multiply all the terms by the denominator
-12a*12+200=0
Wy multiply elements
-144a+200=0
We move all terms containing a to the left, all other terms to the right
-144a=-200
a=-200/-144
a=1+7/18
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