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14.3+(-0.2x)=13.9
We move all terms to the left:
14.3+(-0.2x)-(13.9)=0
We add all the numbers together, and all the variables
(-0.2x)+0.4=0
We get rid of parentheses
-0.2x+0.4=0
We move all terms containing x to the left, all other terms to the right
-0.2x=-0.4
x=-0.4/-0.2
x=+2
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