6+x+x+9=9

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Solution for 6+x+x+9=9 equation: 



6+x+x+9=9

We move all terms to the left:

6+x+x+9-(9)=0

We add all the numbers together, and all the variables

2x+6=0

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

2x=-6

x=-6/2

x=-3

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