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3.9=5.9-0.5x
We move all terms to the left:
3.9-(5.9-0.5x)=0
We add all the numbers together, and all the variables
-(-0.5x+5.9)+3.9=0
We get rid of parentheses
0.5x-5.9+3.9=0
We add all the numbers together, and all the variables
0.5x-2=0
We move all terms containing x to the left, all other terms to the right
0.5x=2
x=2/0.5
x=4
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