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15=-4a-5-4
We move all terms to the left:
15-(-4a-5-4)=0
We add all the numbers together, and all the variables
-(-4a-9)+15=0
We get rid of parentheses
4a+9+15=0
We add all the numbers together, and all the variables
4a+24=0
We move all terms containing a to the left, all other terms to the right
4a=-24
a=-24/4
a=-6
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