.9x=42-x

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Solution for .9x=42-x equation: 



.9x=42-x

We move all terms to the left:

.9x-(42-x)=0

We add all the numbers together, and all the variables

.9x-(-1x+42)=0

We get rid of parentheses

.9x+1x-42=0

We add all the numbers together, and all the variables

1.9x-42=0

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

1.9x=42

x=42/1.9

x=22+0.2/1.9

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