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x+x*1.1+x*0.9=
We move all terms to the left:
x+x*1.1+x*0.9-()=0
We add all the numbers together, and all the variables
x+x*1.1+x*0.9=0
Wy multiply elements
x+1.1x+0.9x=0
We add all the numbers together, and all the variables
3x=0
x=0/3
x=0
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