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(5.21+x)+2x=104.85
We move all terms to the left:
(5.21+x)+2x-(104.85)=0
We add all the numbers together, and all the variables
(x+5.21)+2x-(104.85)=0
We add all the numbers together, and all the variables
2x+(x+5.21)-104.85=0
We get rid of parentheses
2x+x+5.21-104.85=0
We add all the numbers together, and all the variables
3x-99.64=0
We move all terms containing x to the left, all other terms to the right
3x=99.64
x=99.64/3
x=33+0.64/3
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