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2a+8=-6a-18
We move all terms to the left:
2a+8-(-6a-18)=0
We get rid of parentheses
2a+6a+18+8=0
We add all the numbers together, and all the variables
8a+26=0
We move all terms containing a to the left, all other terms to the right
8a=-26
a=-26/8
a=-3+1/4
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