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-16a+19a-15a-(-15a)-(-10a)=13
We move all terms to the left:
-16a+19a-15a-(-15a)-(-10a)-(13)=0
We add all the numbers together, and all the variables
-12a-(-15a)-(-10a)-13=0
We get rid of parentheses
-12a+15a+10a-13=0
We add all the numbers together, and all the variables
13a-13=0
We move all terms containing a to the left, all other terms to the right
13a=13
a=13/13
a=1
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