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13=10+a/5
We move all terms to the left:
13-(10+a/5)=0
We add all the numbers together, and all the variables
-(a/5+10)+13=0
We get rid of parentheses
-a/5-10+13=0
We multiply all the terms by the denominator
-a-10*5+13*5=0
We add all the numbers together, and all the variables
-1a+15=0
We move all terms containing a to the left, all other terms to the right
-a=-15
a=-15/-1
a=+15
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