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7x+3=4x+21+3x
We move all terms to the left:
7x+3-(4x+21+3x)=0
We add all the numbers together, and all the variables
7x-(7x+21)+3=0
We get rid of parentheses
7x-7x-21+3=0
We add all the numbers together, and all the variables
-18!=0
There is no solution for this equation
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