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 add all the numbers together, and all the variables

-(-1x+20)+15=0

We get rid of parentheses

1x-20+15=0

We add all the numbers together, and all the variables

x-5=0

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

x=5

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