7x+8x=-9

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Solution for 7x+8x=-9 equation: 



7x+8x=-9

We move all terms to the left:

7x+8x-(-9)=0

We add all the numbers together, and all the variables

15x+9=0

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

15x=-9

x=-9/15

x=-3/5

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