-21-8u=3(4u+7)

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Solution for -21-8u=3(4u+7) equation:


Simplifying
-21 + -8u = 3(4u + 7)

Reorder the terms:
-21 + -8u = 3(7 + 4u)
-21 + -8u = (7 * 3 + 4u * 3)
-21 + -8u = (21 + 12u)

Solving
-21 + -8u = 21 + 12u

Solving for variable 'u'.

Move all terms containing u to the left, all other terms to the right.

Add '-12u' to each side of the equation.
-21 + -8u + -12u = 21 + 12u + -12u

Combine like terms: -8u + -12u = -20u
-21 + -20u = 21 + 12u + -12u

Combine like terms: 12u + -12u = 0
-21 + -20u = 21 + 0
-21 + -20u = 21

Add '21' to each side of the equation.
-21 + 21 + -20u = 21 + 21

Combine like terms: -21 + 21 = 0
0 + -20u = 21 + 21
-20u = 21 + 21

Combine like terms: 21 + 21 = 42
-20u = 42

Divide each side by '-20'.
u = -2.1

Simplifying
u = -2.1

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