7x+12=x-42

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Solution for 7x+12=x-42 equation: 



7x+12=x-42

We move all terms to the left:

7x+12-(x-42)=0

We get rid of parentheses

7x-x+42+12=0

We add all the numbers together, and all the variables

6x+54=0

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

6x=-54

x=-54/6

x=-9

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