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a/4.2=3.9/2.6
We move all terms to the left:
a/4.2-(3.9/2.6)=0
We add all the numbers together, and all the variables
a/4.2-(+3.9/2.6)=0
We get rid of parentheses
a/4.2-3.9/2.6=0
We calculate fractions
There is no solution for this equation
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