15=x-20

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Solution for 15=x-20 equation: 



15=x-20

We move all terms to the left:

15-(x-20)=0

We get rid of parentheses

-x+20+15=0

We add all the numbers together, and all the variables

-1x+35=0

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

-x=-35

x=-35/-1

x=+35

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