21=3s-4(28-s)

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Solution for 21=3s-4(28-s) equation:


Simplifying
21 = 3s + -4(28 + -1s)
21 = 3s + (28 * -4 + -1s * -4)
21 = 3s + (-112 + 4s)

Reorder the terms:
21 = -112 + 3s + 4s

Combine like terms: 3s + 4s = 7s
21 = -112 + 7s

Solving
21 = -112 + 7s

Solving for variable 's'.

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

Add '-7s' to each side of the equation.
21 + -7s = -112 + 7s + -7s

Combine like terms: 7s + -7s = 0
21 + -7s = -112 + 0
21 + -7s = -112

Add '-21' to each side of the equation.
21 + -21 + -7s = -112 + -21

Combine like terms: 21 + -21 = 0
0 + -7s = -112 + -21
-7s = -112 + -21

Combine like terms: -112 + -21 = -133
-7s = -133

Divide each side by '-7'.
s = 19

Simplifying
s = 19

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