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