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-9x+21=-24x+31
We move all terms to the left:
-9x+21-(-24x+31)=0
We get rid of parentheses
-9x+24x-31+21=0
We add all the numbers together, and all the variables
15x-10=0
We move all terms containing x to the left, all other terms to the right
15x=10
x=10/15
x=2/3
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