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1.2x+4.3=2.1=x
We move all terms to the left:
1.2x+4.3-(2.1)=0
We add all the numbers together, and all the variables
1.2x+2.2=0
We move all terms containing x to the left, all other terms to the right
1.2x=-2.2
x=-2.2/1.2
x=-1+1/1.2
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