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0.3x+2.9=0.8x-0.1
We move all terms to the left:
0.3x+2.9-(0.8x-0.1)=0
We get rid of parentheses
0.3x-0.8x+0.1+2.9=0
We add all the numbers together, and all the variables
-0.5x+3=0
We move all terms containing x to the left, all other terms to the right
-0.5x=-3
x=-3/-0.5
x=+6
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