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-11+a/15=-13
We move all terms to the left:
-11+a/15-(-13)=0
We add all the numbers together, and all the variables
a/15+2=0
We multiply all the terms by the denominator
a+2*15=0
We add all the numbers together, and all the variables
a+30=0
We move all terms containing a to the left, all other terms to the right
a=-30
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