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-39=x-4x-3
We move all terms to the left:
-39-(x-4x-3)=0
We add all the numbers together, and all the variables
-(-3x-3)-39=0
We get rid of parentheses
3x+3-39=0
We add all the numbers together, and all the variables
3x-36=0
We move all terms containing x to the left, all other terms to the right
3x=36
x=36/3
x=12
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