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a=1/2*21*38
We move all terms to the left:
a-(1/2*21*38)=0
We add all the numbers together, and all the variables
a-(+1/2*21*38)=0
We get rid of parentheses
a-1/2*21*38=0
We multiply all the terms by the denominator
a*2*21*38-1=0
Wy multiply elements
1596a*2-1=0
Wy multiply elements
3192a-1=0
We move all terms containing a to the left, all other terms to the right
3192a=1
a=1/3192
a=1/3192
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