15-12u=21-16u

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Solution for 15-12u=21-16u equation: 



15-12u=21-16u

We move all terms to the left:

15-12u-(21-16u)=0

We add all the numbers together, and all the variables

-12u-(-16u+21)+15=0

We get rid of parentheses

-12u+16u-21+15=0

We add all the numbers together, and all the variables

4u-6=0

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

4u=6

u=6/4

u=1+1/2

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