-20=15-5x

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Solution for -20=15-5x equation: 



-20=15-5x

We move all terms to the left:

-20-(15-5x)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

5x-15-20=0

We add all the numbers together, and all the variables

5x-35=0

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

5x=35

x=35/5

x=7

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