x+18+x+20=20

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Solution for x+18+x+20=20 equation: 



x+18+x+20=20

We move all terms to the left:

x+18+x+20-(20)=0

We add all the numbers together, and all the variables

2x+18=0

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

2x=-18

x=-18/2

x=-9

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