15+x+x+x=36

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Solution for 15+x+x+x=36 equation: 



15+x+x+x=36

We move all terms to the left:

15+x+x+x-(36)=0

We add all the numbers together, and all the variables

3x-21=0

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

3x=21

x=21/3

x=7

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