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2.8x+1.65=1.3x-1.2=
We move all terms to the left:
2.8x+1.65-(1.3x-1.2)=0
We get rid of parentheses
2.8x-1.3x+1.2+1.65=0
We add all the numbers together, and all the variables
1.5x+2.85=0
We move all terms containing x to the left, all other terms to the right
1.5x=-2.85
x=-2.85/1.5
x=-1+1/1.11111111111
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