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4x+2.1=55.6
We move all terms to the left:
4x+2.1-(55.6)=0
We add all the numbers together, and all the variables
4x-53.5=0
We move all terms containing x to the left, all other terms to the right
4x=53.5
x=53.5/4
x=13+1/2.6666666666667
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