3x-21=15x-69

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Solution for 3x-21=15x-69 equation: 



3x-21=15x-69

We move all terms to the left:

3x-21-(15x-69)=0

We get rid of parentheses

3x-15x+69-21=0

We add all the numbers together, and all the variables

-12x+48=0

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

-12x=-48

x=-48/-12

x=+4

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