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6a+3=-2a-13
We move all terms to the left:
6a+3-(-2a-13)=0
We get rid of parentheses
6a+2a+13+3=0
We add all the numbers together, and all the variables
8a+16=0
We move all terms containing a to the left, all other terms to the right
8a=-16
a=-16/8
a=-2
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