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4x+2=4.2x+1=
We move all terms to the left:
4x+2-(4.2x+1)=0
We get rid of parentheses
4x-4.2x-1+2=0
We add all the numbers together, and all the variables
-0.2x+1=0
We move all terms containing x to the left, all other terms to the right
-0.2x=-1
x=-1/-0.2
x=+5
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