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4x+2x+1x=1.3
We move all terms to the left:
4x+2x+1x-(1.3)=0
We add all the numbers together, and all the variables
7x-1.3=0
We move all terms containing x to the left, all other terms to the right
7x=1.3
x=1.3/7
x=1/5.38461538462
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