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30+a=4a-3
We move all terms to the left:
30+a-(4a-3)=0
We get rid of parentheses
a-4a+3+30=0
We add all the numbers together, and all the variables
-3a+33=0
We move all terms containing a to the left, all other terms to the right
-3a=-33
a=-33/-3
a=+11
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