12u-7u=40

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Solution for 12u-7u=40 equation: 



12u-7u=40

We move all terms to the left:

12u-7u-(40)=0

We add all the numbers together, and all the variables

5u-40=0

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

5u=40

u=40/5

u=8

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