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4a-10=7a-30
We move all terms to the left:
4a-10-(7a-30)=0
We get rid of parentheses
4a-7a+30-10=0
We add all the numbers together, and all the variables
-3a+20=0
We move all terms containing a to the left, all other terms to the right
-3a=-20
a=-20/-3
a=6+2/3
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