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7x+14=3x+4x+21
We move all terms to the left:
7x+14-(3x+4x+21)=0
We add all the numbers together, and all the variables
7x-(7x+21)+14=0
We get rid of parentheses
7x-7x-21+14=0
We add all the numbers together, and all the variables
-7!=0
There is no solution for this equation
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