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4.3x-2.1x-2.3=12
We move all terms to the left:
4.3x-2.1x-2.3-(12)=0
We add all the numbers together, and all the variables
2.2x-14.3=0
We move all terms containing x to the left, all other terms to the right
2.2x=14.3
x=14.3/2.2
x=6+1/2
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