4x-15=5x-21

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Solution for 4x-15=5x-21 equation: 



4x-15=5x-21

We move all terms to the left:

4x-15-(5x-21)=0

We get rid of parentheses

4x-5x+21-15=0

We add all the numbers together, and all the variables

-1x+6=0

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

-x=-6

x=-6/-1

x=+6

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