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2x-(-4x)=48
We move all terms to the left:
2x-(-4x)-(48)=0
We get rid of parentheses
2x+4x-48=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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