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0=-12x+31x-9
We move all terms to the left:
0-(-12x+31x-9)=0
We add all the numbers together, and all the variables
-(19x-9)+0=0
We add all the numbers together, and all the variables
-(19x-9)=0
We get rid of parentheses
-19x+9=0
We move all terms containing x to the left, all other terms to the right
-19x=-9
x=-9/-19
x=9/19
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