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-3.98+x=2x-4.2
We move all terms to the left:
-3.98+x-(2x-4.2)=0
We get rid of parentheses
x-2x+4.2-3.98=0
We add all the numbers together, and all the variables
-1x+0.22=0
We move all terms containing x to the left, all other terms to the right
-x=-0.22
x=-0.22/-1
x=0.22/1
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