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