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3x+5x-x+7=7x+7
We move all terms to the left:
3x+5x-x+7-(7x+7)=0
We add all the numbers together, and all the variables
7x-(7x+7)+7=0
We get rid of parentheses
7x-7x-7+7=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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