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x+x-0.9=19.19
We move all terms to the left:
x+x-0.9-(19.19)=0
We add all the numbers together, and all the variables
2x-20.09=0
We move all terms containing x to the left, all other terms to the right
2x=20.09
x=20.09/2
x=10+0.09/2
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