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-7=0.33a
We move all terms to the left:
-7-(0.33a)=0
We add all the numbers together, and all the variables
-(+0.33a)-7=0
We get rid of parentheses
-0.33a-7=0
We move all terms containing a to the left, all other terms to the right
-0.33a=7
a=7/-0.33
a=-21+0.069999999999999/0.33
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