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3+6x-9x-7=-3x-4
We move all terms to the left:
3+6x-9x-7-(-3x-4)=0
We add all the numbers together, and all the variables
-3x-(-3x-4)-4=0
We get rid of parentheses
-3x+3x+4-4=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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