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13/25=a
We move all terms to the left:
13/25-(a)=0
We add all the numbers together, and all the variables
-1a+13/25=0
We multiply all the terms by the denominator
-1a*25+13=0
Wy multiply elements
-25a+13=0
We move all terms containing a to the left, all other terms to the right
-25a=-13
a=-13/-25
a=13/25
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