x-4=8;x=12

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Solution for x-4=8;x=12 equation: 



x-4=8x=12

We move all terms to the left:

x-4-(8x)=0

We add all the numbers together, and all the variables

-7x-4=0

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

-7x=4

x=4/-7

x=-4/7

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