12+2u=20

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Solution for 12+2u=20 equation: 



12+2u=20

We move all terms to the left:

12+2u-(20)=0

We add all the numbers together, and all the variables

2u-8=0

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

2u=8

u=8/2

u=4

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