7x-12=9x-20

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Solution for 7x-12=9x-20 equation: 



7x-12=9x-20

We move all terms to the left:

7x-12-(9x-20)=0

We get rid of parentheses

7x-9x+20-12=0

We add all the numbers together, and all the variables

-2x+8=0

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

-2x=-8

x=-8/-2

x=+4

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