x-90=0.1*x

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Solution for x-90=0.1*x equation:



x-90=0.1x
We move all terms to the left:
x-90-(0.1x)=0
We add all the numbers together, and all the variables
x-(+0.1x)-90=0
We get rid of parentheses
x-0.1x-90=0
We add all the numbers together, and all the variables
0.9x-90=0
We move all terms containing x to the left, all other terms to the right
0.9x=90
x=90/0.9
x=100

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