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0.3x+1.1=0.8x-2.9
We move all terms to the left:
0.3x+1.1-(0.8x-2.9)=0
We get rid of parentheses
0.3x-0.8x+2.9+1.1=0
We add all the numbers together, and all the variables
-0.5x+4=0
We move all terms containing x to the left, all other terms to the right
-0.5x=-4
x=-4/-0.5
x=+8
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