21=5+4(s-5)

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Solution for 21=5+4(s-5) equation:


Simplifying
21 = 5 + 4(s + -5)

Reorder the terms:
21 = 5 + 4(-5 + s)
21 = 5 + (-5 * 4 + s * 4)
21 = 5 + (-20 + 4s)

Combine like terms: 5 + -20 = -15
21 = -15 + 4s

Solving
21 = -15 + 4s

Solving for variable 's'.

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

Add '-4s' to each side of the equation.
21 + -4s = -15 + 4s + -4s

Combine like terms: 4s + -4s = 0
21 + -4s = -15 + 0
21 + -4s = -15

Add '-21' to each side of the equation.
21 + -21 + -4s = -15 + -21

Combine like terms: 21 + -21 = 0
0 + -4s = -15 + -21
-4s = -15 + -21

Combine like terms: -15 + -21 = -36
-4s = -36

Divide each side by '-4'.
s = 9

Simplifying
s = 9

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