x+x-x+x=20

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Solution for x+x-x+x=20 equation: 



x+x-x+x=20

We move all terms to the left:

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

We add all the numbers together, and all the variables

2x-20=0

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

2x=20

x=20/2

x=10

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