3x+15=5x-21

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Solution for 3x+15=5x-21 equation: 



3x+15=5x-21

We move all terms to the left:

3x+15-(5x-21)=0

We get rid of parentheses

3x-5x+21+15=0

We add all the numbers together, and all the variables

-2x+36=0

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

-2x=-36

x=-36/-2

x=+18

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