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0.333(21-3a)=6-a
We move all terms to the left:
0.333(21-3a)-(6-a)=0
We add all the numbers together, and all the variables
0.333(-3a+21)-(-1a+6)=0
We multiply parentheses
-0.999a-(-1a+6)+6.993=0
We get rid of parentheses
-0.999a+1a-6+6.993=0
We add all the numbers together, and all the variables
0.001a+0.993=0
We move all terms containing a to the left, all other terms to the right
0.001a=-0.993
a=-0.993/0.001
a=-993
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