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x=39.99+0.50x
We move all terms to the left:
x-(39.99+0.50x)=0
We add all the numbers together, and all the variables
x-(0.50x+39.99)=0
We get rid of parentheses
x-0.50x-39.99=0
We add all the numbers together, and all the variables
0.5x-39.99=0
We move all terms containing x to the left, all other terms to the right
0.5x=39.99
x=39.99/0.5
x=79+0.49/0.5
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