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2.1=0.3x
We move all terms to the left:
2.1-(0.3x)=0
We add all the numbers together, and all the variables
-(+0.3x)+2.1=0
We get rid of parentheses
-0.3x+2.1=0
We move all terms containing x to the left, all other terms to the right
-0.3x=-2.1
x=-2.1/-0.3
x=+7
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