x+x+21=87

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Solution for x+x+21=87 equation: 



x+x+21=87

We move all terms to the left:

x+x+21-(87)=0

We add all the numbers together, and all the variables

2x-66=0

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

2x=66

x=66/2

x=33

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