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1.8+x-3.9=-2+5.7
We move all terms to the left:
1.8+x-3.9-(-2+5.7)=0
We add all the numbers together, and all the variables
x+1.8-3.9-(3.7)=0
We add all the numbers together, and all the variables
x-5.8=0
We move all terms containing x to the left, all other terms to the right
x=5.8
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