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4.2=x+1.8
We move all terms to the left:
4.2-(x+1.8)=0
We get rid of parentheses
-x-1.8+4.2=0
We add all the numbers together, and all the variables
-1x+2.4=0
We move all terms containing x to the left, all other terms to the right
-x=-2.4
x=-2.4/-1
x=2+0.4/1
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