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9-5x-3=-4x-21+2x
We move all terms to the left:
9-5x-3-(-4x-21+2x)=0
We add all the numbers together, and all the variables
-5x-(-2x-21)+9-3=0
We add all the numbers together, and all the variables
-5x-(-2x-21)+6=0
We get rid of parentheses
-5x+2x+21+6=0
We add all the numbers together, and all the variables
-3x+27=0
We move all terms containing x to the left, all other terms to the right
-3x=-27
x=-27/-3
x=+9
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