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x/0.7=21.21/3
We move all terms to the left:
x/0.7-(21.21/3)=0
We add all the numbers together, and all the variables
x/0.7-(+21.21/3)=0
We get rid of parentheses
x/0.7-21.21/3=0
We calculate fractions
There is no solution for this equation
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