x+9+x+12=13

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Solution for x+9+x+12=13 equation: 



x+9+x+12=13

We move all terms to the left:

x+9+x+12-(13)=0

We add all the numbers together, and all the variables

2x+8=0

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

2x=-8

x=-8/2

x=-4

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