7x-21=12x-36

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Solution for 7x-21=12x-36 equation: 



7x-21=12x-36

We move all terms to the left:

7x-21-(12x-36)=0

We get rid of parentheses

7x-12x+36-21=0

We add all the numbers together, and all the variables

-5x+15=0

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

-5x=-15

x=-15/-5

x=+3

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