15=40-x

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Solution for 15=40-x equation: 



15=40-x

We move all terms to the left:

15-(40-x)=0

We add all the numbers together, and all the variables

-(-1x+40)+15=0

We get rid of parentheses

1x-40+15=0

We add all the numbers together, and all the variables

x-25=0

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

x=25

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