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