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-a-5=-13-3a
We move all terms to the left:
-a-5-(-13-3a)=0
We add all the numbers together, and all the variables
-a-(-3a-13)-5=0
We add all the numbers together, and all the variables
-1a-(-3a-13)-5=0
We get rid of parentheses
-1a+3a+13-5=0
We add all the numbers together, and all the variables
2a+8=0
We move all terms containing a to the left, all other terms to the right
2a=-8
a=-8/2
a=-4
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