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45+0.5x+2x+x=465
We move all terms to the left:
45+0.5x+2x+x-(465)=0
We add all the numbers together, and all the variables
3.5x-420=0
We move all terms containing x to the left, all other terms to the right
3.5x=420
x=420/3.5
x=120
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