x+1=3+9

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Solution for x+1=3+9 equation: 



x+1=3+9

We move all terms to the left:

x+1-(3+9)=0

We add all the numbers together, and all the variables

x+1-12=0

We add all the numbers together, and all the variables

x-11=0

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

x=11

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