7x=12-40

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Solution for 7x=12-40 equation: 



7x=12-40

We move all terms to the left:

7x-(12-40)=0

We add all the numbers together, and all the variables

7x-(-28)=0

We add all the numbers together, and all the variables

7x+28=0

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

7x=-28

x=-28/7

x=-4

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