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x+2x+7+x=99+1
We move all terms to the left:
x+2x+7+x-(99+1)=0
We add all the numbers together, and all the variables
x+2x+x+7-100=0
We add all the numbers together, and all the variables
4x-93=0
We move all terms containing x to the left, all other terms to the right
4x=93
x=93/4
x=23+1/4
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