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16a+2a=-a-4-7a
We move all terms to the left:
16a+2a-(-a-4-7a)=0
We add all the numbers together, and all the variables
16a+2a-(-8a-4)=0
We add all the numbers together, and all the variables
18a-(-8a-4)=0
We get rid of parentheses
18a+8a+4=0
We add all the numbers together, and all the variables
26a+4=0
We move all terms containing a to the left, all other terms to the right
26a=-4
a=-4/26
a=-2/13
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