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2x+x+(5+2x)=100
We move all terms to the left:
2x+x+(5+2x)-(100)=0
We add all the numbers together, and all the variables
2x+x+(2x+5)-100=0
We add all the numbers together, and all the variables
3x+(2x+5)-100=0
We get rid of parentheses
3x+2x+5-100=0
We add all the numbers together, and all the variables
5x-95=0
We move all terms containing x to the left, all other terms to the right
5x=95
x=95/5
x=19
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