x-15=21.

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Solution for x-15=21. equation: 



x-15=21.

We move all terms to the left:

x-15-(21.)=0

We add all the numbers together, and all the variables

x-15-21=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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