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39.99+0.45x=49.99+0.40x
We move all terms to the left:
39.99+0.45x-(49.99+0.40x)=0
We add all the numbers together, and all the variables
0.45x-(0.40x+49.99)+39.99=0
We get rid of parentheses
0.45x-0.40x-49.99+39.99=0
We add all the numbers together, and all the variables
0.05x-10=0
We move all terms containing x to the left, all other terms to the right
0.05x=10
x=10/0.05
x=200
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