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15+a-17=16+a-19
We move all terms to the left:
15+a-17-(16+a-19)=0
We add all the numbers together, and all the variables
a-(a-3)+15-17=0
We add all the numbers together, and all the variables
a-(a-3)-2=0
We get rid of parentheses
a-a+3-2=0
We add all the numbers together, and all the variables
1!=0
There is no solution for this equation
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