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4.3-x=-2.1
We move all terms to the left:
4.3-x-(-2.1)=0
We add all the numbers together, and all the variables
-1x+6.4=0
We move all terms containing x to the left, all other terms to the right
-x=-6.4
x=-6.4/-1
x=6+0.4/1
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