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9-x=13+3x
We move all terms to the left:
9-x-(13+3x)=0
We add all the numbers together, and all the variables
-x-(3x+13)+9=0
We add all the numbers together, and all the variables
-1x-(3x+13)+9=0
We get rid of parentheses
-1x-3x-13+9=0
We add all the numbers together, and all the variables
-4x-4=0
We move all terms containing x to the left, all other terms to the right
-4x=4
x=4/-4
x=-1
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