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

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


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

Reorder the terms:
-21 = 8(3 + u) + 7u
-21 = (3 * 8 + u * 8) + 7u
-21 = (24 + 8u) + 7u

Combine like terms: 8u + 7u = 15u
-21 = 24 + 15u

Solving
-21 = 24 + 15u

Solving for variable 'u'.

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

Add '-15u' to each side of the equation.
-21 + -15u = 24 + 15u + -15u

Combine like terms: 15u + -15u = 0
-21 + -15u = 24 + 0
-21 + -15u = 24

Add '21' to each side of the equation.
-21 + 21 + -15u = 24 + 21

Combine like terms: -21 + 21 = 0
0 + -15u = 24 + 21
-15u = 24 + 21

Combine like terms: 24 + 21 = 45
-15u = 45

Divide each side by '-15'.
u = -3

Simplifying
u = -3

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