40-x=55-2x

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Solution for 40-x=55-2x equation: 



40-x=55-2x

We move all terms to the left:

40-x-(55-2x)=0

We add all the numbers together, and all the variables

-x-(-2x+55)+40=0

We add all the numbers together, and all the variables

-1x-(-2x+55)+40=0

We get rid of parentheses

-1x+2x-55+40=0

We add all the numbers together, and all the variables

x-15=0

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

x=15

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