-4u-3=-21-2u

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Solution for -4u-3=-21-2u equation: 



-4u-3=-21-2u

We move all terms to the left:

-4u-3-(-21-2u)=0

We add all the numbers together, and all the variables

-4u-(-2u-21)-3=0

We get rid of parentheses

-4u+2u+21-3=0

We add all the numbers together, and all the variables

-2u+18=0

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

-2u=-18

u=-18/-2

u=+9

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