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6x+9-12x=-13-x
We move all terms to the left:
6x+9-12x-(-13-x)=0
We add all the numbers together, and all the variables
6x-12x-(-1x-13)+9=0
We add all the numbers together, and all the variables
-6x-(-1x-13)+9=0
We get rid of parentheses
-6x+1x+13+9=0
We add all the numbers together, and all the variables
-5x+22=0
We move all terms containing x to the left, all other terms to the right
-5x=-22
x=-22/-5
x=4+2/5
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