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-5a=-1/2
We move all terms to the left:
-5a-(-1/2)=0
We get rid of parentheses
-5a+1/2=0
We multiply all the terms by the denominator
-5a*2+1=0
Wy multiply elements
-10a+1=0
We move all terms containing a to the left, all other terms to the right
-10a=-1
a=-1/-10
a=1/10
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