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3x-0.8=-0.3x-1.66
We move all terms to the left:
3x-0.8-(-0.3x-1.66)=0
We get rid of parentheses
3x+0.3x+1.66-0.8=0
We add all the numbers together, and all the variables
3.3x+0.86=0
We move all terms containing x to the left, all other terms to the right
3.3x=-0.86
x=-0.86/3.3
x=-0.86/3.3
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