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4x+9=-2x+57
We move all terms to the left:
4x+9-(-2x+57)=0
We get rid of parentheses
4x+2x-57+9=0
We add all the numbers together, and all the variables
6x-48=0
We move all terms containing x to the left, all other terms to the right
6x=48
x=48/6
x=8
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