4x-15=x-21

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



4x-15=x-21

We move all terms to the left:

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

We get rid of parentheses

4x-x+21-15=0

We add all the numbers together, and all the variables

3x+6=0

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

3x=-6

x=-6/3

x=-2

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