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28+8a=-18-8a
We move all terms to the left:
28+8a-(-18-8a)=0
We add all the numbers together, and all the variables
8a-(-8a-18)+28=0
We get rid of parentheses
8a+8a+18+28=0
We add all the numbers together, and all the variables
16a+46=0
We move all terms containing a to the left, all other terms to the right
16a=-46
a=-46/16
a=-2+7/8
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