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100x-x=19.9
We move all terms to the left:
100x-x-(19.9)=0
We add all the numbers together, and all the variables
99x-19.9=0
We move all terms containing x to the left, all other terms to the right
99x=19.9
x=19.9/99
x=10.4736842105/52.1052631579
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