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4a-5=7a+10
We move all terms to the left:
4a-5-(7a+10)=0
We get rid of parentheses
4a-7a-10-5=0
We add all the numbers together, and all the variables
-3a-15=0
We move all terms containing a to the left, all other terms to the right
-3a=15
a=15/-3
a=-5
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