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1=0.3x-0.8x=39
We move all terms to the left:
1-(0.3x-0.8x)=0
We add all the numbers together, and all the variables
-(-0.5x)+1=0
We get rid of parentheses
0.5x+1=0
We move all terms containing x to the left, all other terms to the right
0.5x=-1
x=-1/0.5
x=-2
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