21+15=3x=

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Solution for 21+15=3x= equation: 



21+15=3x=

We move all terms to the left:

21+15-(3x)=0

We add all the numbers together, and all the variables

-3x+36=0

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

-3x=-36

x=-36/-3

x=+12

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