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x+x+0.9+4x=19
We move all terms to the left:
x+x+0.9+4x-(19)=0
We add all the numbers together, and all the variables
6x-18.1=0
We move all terms containing x to the left, all other terms to the right
6x=18.1
x=18.1/6
x=3+0.1/6
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