4x-15=7x+21

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Solution for 4x-15=7x+21 equation: 



4x-15=7x+21

We move all terms to the left:

4x-15-(7x+21)=0

We get rid of parentheses

4x-7x-21-15=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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