140=170-x

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Solution for 140=170-x equation: 



140=170-x

We move all terms to the left:

140-(170-x)=0

We add all the numbers together, and all the variables

-(-1x+170)+140=0

We get rid of parentheses

1x-170+140=0

We add all the numbers together, and all the variables

x-30=0

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

x=30

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