x+8-7x=20

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Solution for x+8-7x=20 equation: 



x+8-7x=20

We move all terms to the left:

x+8-7x-(20)=0

We add all the numbers together, and all the variables

-6x-12=0

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

-6x=12

x=12/-6

x=-2

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