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a+39/2=15/2
We move all terms to the left:
a+39/2-(15/2)=0
We add all the numbers together, and all the variables
a+39/2-(+15/2)=0
We get rid of parentheses
a+39/2-15/2=0
We multiply all the terms by the denominator
a*2+39-15=0
We add all the numbers together, and all the variables
a*2+24=0
Wy multiply elements
2a+24=0
We move all terms containing a to the left, all other terms to the right
2a=-24
a=-24/2
a=-12
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