100-x=40-4x

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Solution for 100-x=40-4x equation: 



100-x=40-4x

We move all terms to the left:

100-x-(40-4x)=0

We add all the numbers together, and all the variables

-x-(-4x+40)+100=0

We add all the numbers together, and all the variables

-1x-(-4x+40)+100=0

We get rid of parentheses

-1x+4x-40+100=0

We add all the numbers together, and all the variables

3x+60=0

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

3x=-60

x=-60/3

x=-20

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