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6+x=0.5x+9.9
We move all terms to the left:
6+x-(0.5x+9.9)=0
We get rid of parentheses
x-0.5x-9.9+6=0
We add all the numbers together, and all the variables
0.5x-3.9=0
We move all terms containing x to the left, all other terms to the right
0.5x=3.9
x=3.9/0.5
x=7+0.4/0.5
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