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x+x*0.9=50
We move all terms to the left:
x+x*0.9-(50)=0
Wy multiply elements
x+0.9x-50=0
We add all the numbers together, and all the variables
1.9x-50=0
We move all terms containing x to the left, all other terms to the right
1.9x=50
x=50/1.9
x=26+0.6/1.9
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