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2x+(x+5)=281
We move all terms to the left:
2x+(x+5)-(281)=0
We get rid of parentheses
2x+x+5-281=0
We add all the numbers together, and all the variables
3x-276=0
We move all terms containing x to the left, all other terms to the right
3x=276
x=276/3
x=92
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