3x=-x=40

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Solution for 3x=-x=40 equation: 



3x=-x=40

We move all terms to the left:

3x-(-x)=0

We add all the numbers together, and all the variables

3x-(-1x)=0

We get rid of parentheses

3x+1x=0

We add all the numbers together, and all the variables

4x=0

x=0/4

x=0

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