10+x+x=9

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Solution for 10+x+x=9 equation: 



10+x+x=9

We move all terms to the left:

10+x+x-(9)=0

We add all the numbers together, and all the variables

2x+1=0

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

2x=-1

x=-1/2

x=-1/2

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