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2x+1.6=4.2
We move all terms to the left:
2x+1.6-(4.2)=0
We add all the numbers together, and all the variables
2x-2.6=0
We move all terms containing x to the left, all other terms to the right
2x=2.6
x=2.6/2
x=1+0.6/2
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