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3x+4x+0.5x=1000
We move all terms to the left:
3x+4x+0.5x-(1000)=0
We add all the numbers together, and all the variables
7.5x-1000=0
We move all terms containing x to the left, all other terms to the right
7.5x=1000
x=1000/7.5
x=133+2.5/7.5
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