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x+3+2x+11+4x-7=100
We move all terms to the left:
x+3+2x+11+4x-7-(100)=0
We add all the numbers together, and all the variables
7x-93=0
We move all terms containing x to the left, all other terms to the right
7x=93
x=93/7
x=13+2/7
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