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48=-8a-100
We move all terms to the left:
48-(-8a-100)=0
We get rid of parentheses
8a+100+48=0
We add all the numbers together, and all the variables
8a+148=0
We move all terms containing a to the left, all other terms to the right
8a=-148
a=-148/8
a=-18+1/2
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