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x+(6+2x)=276
We move all terms to the left:
x+(6+2x)-(276)=0
We add all the numbers together, and all the variables
x+(2x+6)-276=0
We get rid of parentheses
x+2x+6-276=0
We add all the numbers together, and all the variables
3x-270=0
We move all terms containing x to the left, all other terms to the right
3x=270
x=270/3
x=90
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