12u-7u-u=12

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Solution for 12u-7u-u=12 equation: 



12u-7u-u=12

We move all terms to the left:

12u-7u-u-(12)=0

We add all the numbers together, and all the variables

4u-12=0

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

4u=12

u=12/4

u=3

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