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3-9x=13-4x
We move all terms to the left:
3-9x-(13-4x)=0
We add all the numbers together, and all the variables
-9x-(-4x+13)+3=0
We get rid of parentheses
-9x+4x-13+3=0
We add all the numbers together, and all the variables
-5x-10=0
We move all terms containing x to the left, all other terms to the right
-5x=10
x=10/-5
x=-2
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