4x+15=20+-1x

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Solution for 4x+15=20+-1x equation: 



4x+15=20+-1x

We move all terms to the left:

4x+15-(20+-1x)=0

We add all the numbers together, and all the variables

4x-(-1x)+15=0

We get rid of parentheses

4x+1x+15=0

We add all the numbers together, and all the variables

5x+15=0

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

5x=-15

x=-15/5

x=-3

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