140=300-20x

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Solution for 140=300-20x equation: 



140=300-20x

We move all terms to the left:

140-(300-20x)=0

We add all the numbers together, and all the variables

-(-20x+300)+140=0

We get rid of parentheses

20x-300+140=0

We add all the numbers together, and all the variables

20x-160=0

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

20x=160

x=160/20

x=8

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