18+21+17+x=20

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Solution for 18+21+17+x=20 equation: 



18+21+17+x=20

We move all terms to the left:

18+21+17+x-(20)=0

We add all the numbers together, and all the variables

x+36=0

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

x=-36

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