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6.4x+2.3=42.1
We move all terms to the left:
6.4x+2.3-(42.1)=0
We add all the numbers together, and all the variables
6.4x-39.8=0
We move all terms containing x to the left, all other terms to the right
6.4x=39.8
x=39.8/6.4
x=6+1/4.5714285714286
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