21x-15=4x+36

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Solution for 21x-15=4x+36 equation: 



21x-15=4x+36

We move all terms to the left:

21x-15-(4x+36)=0

We get rid of parentheses

21x-4x-36-15=0

We add all the numbers together, and all the variables

17x-51=0

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

17x=51

x=51/17

x=3

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