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4x-0.2=2.1
We move all terms to the left:
4x-0.2-(2.1)=0
We add all the numbers together, and all the variables
4x-2.3=0
We move all terms containing x to the left, all other terms to the right
4x=2.3
x=2.3/4
x=1/1.7391304347826
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