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x+2.75x=4.125
We move all terms to the left:
x+2.75x-(4.125)=0
We add all the numbers together, and all the variables
3.75x-4.125=0
We move all terms containing x to the left, all other terms to the right
3.75x=4.125
x=4.125/3.75
x=1+0.375/3.75
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