20x=90-x

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Solution for 20x=90-x equation: 



20x=90-x

We move all terms to the left:

20x-(90-x)=0

We add all the numbers together, and all the variables

20x-(-1x+90)=0

We get rid of parentheses

20x+1x-90=0

We add all the numbers together, and all the variables

21x-90=0

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

21x=90

x=90/21

x=4+2/7

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