7x+12=9x-72

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Solution for 7x+12=9x-72 equation: 



7x+12=9x-72

We move all terms to the left:

7x+12-(9x-72)=0

We get rid of parentheses

7x-9x+72+12=0

We add all the numbers together, and all the variables

-2x+84=0

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

-2x=-84

x=-84/-2

x=+42

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