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