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1/2=-18a
We move all terms to the left:
1/2-(-18a)=0
We get rid of parentheses
18a+1/2=0
We multiply all the terms by the denominator
18a*2+1=0
Wy multiply elements
36a+1=0
We move all terms containing a to the left, all other terms to the right
36a=-1
a=-1/36
a=-1/36
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