100-4x=55-x

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Solution for 100-4x=55-x equation: 



100-4x=55-x

We move all terms to the left:

100-4x-(55-x)=0

We add all the numbers together, and all the variables

-4x-(-1x+55)+100=0

We get rid of parentheses

-4x+1x-55+100=0

We add all the numbers together, and all the variables

-3x+45=0

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

-3x=-45

x=-45/-3

x=+15

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