12x-15=4x+21

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Solution for 12x-15=4x+21 equation: 



12x-15=4x+21

We move all terms to the left:

12x-15-(4x+21)=0

We get rid of parentheses

12x-4x-21-15=0

We add all the numbers together, and all the variables

8x-36=0

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

8x=36

x=36/8

x=4+1/2

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