(-3x-9)-(4x+8)=0

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Solution for (-3x-9)-(4x+8)=0 equation: 



(-3x-9)-(4x+8)=0

We get rid of parentheses

-3x-4x-9-8=0

We add all the numbers together, and all the variables

-7x-17=0

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

-7x=17

x=17/-7

x=-2+3/7

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