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5.5x+3x=1200
We move all terms to the left:
5.5x+3x-(1200)=0
We add all the numbers together, and all the variables
8.5x-1200=0
We move all terms containing x to the left, all other terms to the right
8.5x=1200
x=1200/8.5
x=141+1/5.6666666666667
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