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21.9x+4=21.9x
We move all terms to the left:
21.9x+4-(21.9x)=0
We add all the numbers together, and all the variables
21.9x-(+21.9x)+4=0
We get rid of parentheses
21.9x-21.9x+4=0
We add all the numbers together, and all the variables
4!=0
There is no solution for this equation
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