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23=13-9x
We move all terms to the left:
23-(13-9x)=0
We add all the numbers together, and all the variables
-(-9x+13)+23=0
We get rid of parentheses
9x-13+23=0
We add all the numbers together, and all the variables
9x+10=0
We move all terms containing x to the left, all other terms to the right
9x=-10
x=-10/9
x=-1+1/9
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