-5x+7x-21=-9

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Solution for -5x+7x-21=-9 equation: 



-5x+7x-21=-9

We move all terms to the left:

-5x+7x-21-(-9)=0

We add all the numbers together, and all the variables

2x-12=0

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

2x=12

x=12/2

x=6

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