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3=-6-3a+6a
We move all terms to the left:
3-(-6-3a+6a)=0
We add all the numbers together, and all the variables
-(3a-6)+3=0
We get rid of parentheses
-3a+6+3=0
We add all the numbers together, and all the variables
-3a+9=0
We move all terms containing a to the left, all other terms to the right
-3a=-9
a=-9/-3
a=+3
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