12x-15=7x-21

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Solution for 12x-15=7x-21 equation: 



12x-15=7x-21

We move all terms to the left:

12x-15-(7x-21)=0

We get rid of parentheses

12x-7x+21-15=0

We add all the numbers together, and all the variables

5x+6=0

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

5x=-6

x=-6/5

x=-1+1/5

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