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