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3=-3+a-4a
We move all terms to the left:
3-(-3+a-4a)=0
We add all the numbers together, and all the variables
-(-3a-3)+3=0
We get rid of parentheses
3a+3+3=0
We add all the numbers together, and all the variables
3a+6=0
We move all terms containing a to the left, all other terms to the right
3a=-6
a=-6/3
a=-2
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