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x+(x-4)=240
We move all terms to the left:
x+(x-4)-(240)=0
We get rid of parentheses
x+x-4-240=0
We add all the numbers together, and all the variables
2x-244=0
We move all terms containing x to the left, all other terms to the right
2x=244
x=244/2
x=122
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