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