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1x+1.5x+2x=7
We move all terms to the left:
1x+1.5x+2x-(7)=0
We add all the numbers together, and all the variables
4.5x-7=0
We move all terms containing x to the left, all other terms to the right
4.5x=7
x=7/4.5
x=1+1/1.8
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