4u-21=9(u-4)

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Solution for 4u-21=9(u-4) equation:


Simplifying
4u + -21 = 9(u + -4)

Reorder the terms:
-21 + 4u = 9(u + -4)

Reorder the terms:
-21 + 4u = 9(-4 + u)
-21 + 4u = (-4 * 9 + u * 9)
-21 + 4u = (-36 + 9u)

Solving
-21 + 4u = -36 + 9u

Solving for variable 'u'.

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

Add '-9u' to each side of the equation.
-21 + 4u + -9u = -36 + 9u + -9u

Combine like terms: 4u + -9u = -5u
-21 + -5u = -36 + 9u + -9u

Combine like terms: 9u + -9u = 0
-21 + -5u = -36 + 0
-21 + -5u = -36

Add '21' to each side of the equation.
-21 + 21 + -5u = -36 + 21

Combine like terms: -21 + 21 = 0
0 + -5u = -36 + 21
-5u = -36 + 21

Combine like terms: -36 + 21 = -15
-5u = -15

Divide each side by '-5'.
u = 3

Simplifying
u = 3

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