15=20-5x

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Solution for 15=20-5x equation: 



15=20-5x

We move all terms to the left:

15-(20-5x)=0

We add all the numbers together, and all the variables

-(-5x+20)+15=0

We get rid of parentheses

5x-20+15=0

We add all the numbers together, and all the variables

5x-5=0

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

5x=5

x=5/5

x=1

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