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2.75x+x+6x=30
We move all terms to the left:
2.75x+x+6x-(30)=0
We add all the numbers together, and all the variables
9.75x-30=0
We move all terms containing x to the left, all other terms to the right
9.75x=30
x=30/9.75
x=3+0.75/9.75
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