15x-21=8x+12

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Solution for 15x-21=8x+12 equation: 



15x-21=8x+12

We move all terms to the left:

15x-21-(8x+12)=0

We get rid of parentheses

15x-8x-12-21=0

We add all the numbers together, and all the variables

7x-33=0

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

7x=33

x=33/7

x=4+5/7

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