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30=2a-6
We move all terms to the left:
30-(2a-6)=0
We get rid of parentheses
-2a+6+30=0
We add all the numbers together, and all the variables
-2a+36=0
We move all terms containing a to the left, all other terms to the right
-2a=-36
a=-36/-2
a=+18
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