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1.5x+x+x+1.40=3.5
We move all terms to the left:
1.5x+x+x+1.40-(3.5)=0
We add all the numbers together, and all the variables
3.5x-2.1=0
We move all terms containing x to the left, all other terms to the right
3.5x=2.1
x=2.1/3.5
x=2.1/3.5
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