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7(x+3)=7x-9
We move all terms to the left:
7(x+3)-(7x-9)=0
We multiply parentheses
7x-(7x-9)+21=0
We get rid of parentheses
7x-7x+9+21=0
We add all the numbers together, and all the variables
30!=0
There is no solution for this equation
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