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2.9=3.9-0.2x
We move all terms to the left:
2.9-(3.9-0.2x)=0
We add all the numbers together, and all the variables
-(-0.2x+3.9)+2.9=0
We get rid of parentheses
0.2x-3.9+2.9=0
We add all the numbers together, and all the variables
0.2x-1=0
We move all terms containing x to the left, all other terms to the right
0.2x=1
x=1/0.2
x=5
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