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.0.67a+3.06=0.84a
We move all terms to the left:
.0.67a+3.06-(0.84a)=0
We add all the numbers together, and all the variables
.0.67a-(+0.84a)+3.06=0
We add all the numbers together, and all the variables
-(+0.84a)+3.06=0
We get rid of parentheses
-0.84a+3.06=0
We move all terms containing a to the left, all other terms to the right
-0.84a=-3.06
a=-3.06/-0.84
a=3+0.54/0.84
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