1x+20=90-x

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Solution for 1x+20=90-x equation: 



1x+20=90-x

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

x+1x-90+20=0

We add all the numbers together, and all the variables

2x-70=0

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

2x=70

x=70/2

x=35

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