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-5+a/2=-15
We move all terms to the left:
-5+a/2-(-15)=0
We add all the numbers together, and all the variables
a/2+10=0
We multiply all the terms by the denominator
a+10*2=0
We add all the numbers together, and all the variables
a+20=0
We move all terms containing a to the left, all other terms to the right
a=-20
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