6x+7+8x=-21

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Solution for 6x+7+8x=-21 equation: 



6x+7+8x=-21

We move all terms to the left:

6x+7+8x-(-21)=0

We add all the numbers together, and all the variables

14x+28=0

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

14x=-28

x=-28/14

x=-2

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