X-90=0.3x

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Solution for X-90=0.3x equation: 



X-90=0.3X

We move all terms to the left:

X-90-(0.3X)=0

We add all the numbers together, and all the variables

X-(+0.3X)-90=0

We get rid of parentheses

X-0.3X-90=0

We add all the numbers together, and all the variables

0.7X-90=0

We move all terms containing X to the left, all other terms to the right

0.7X=90

X=90/0.7

X=128+0.40000000000001/0.7

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