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x+9-4x=-3x
We move all terms to the left:
x+9-4x-(-3x)=0
We add all the numbers together, and all the variables
-3x-(-3x)+9=0
We get rid of parentheses
-3x+3x+9=0
We add all the numbers together, and all the variables
9!=0
There is no solution for this equation
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