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10a+5=4a-13
We move all terms to the left:
10a+5-(4a-13)=0
We get rid of parentheses
10a-4a+13+5=0
We add all the numbers together, and all the variables
6a+18=0
We move all terms containing a to the left, all other terms to the right
6a=-18
a=-18/6
a=-3
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