21=3s-4(21-s)

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


Simplifying
21 = 3s + -4(21 + -1s)
21 = 3s + (21 * -4 + -1s * -4)
21 = 3s + (-84 + 4s)

Reorder the terms:
21 = -84 + 3s + 4s

Combine like terms: 3s + 4s = 7s
21 = -84 + 7s

Solving
21 = -84 + 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 = -84 + 7s + -7s

Combine like terms: 7s + -7s = 0
21 + -7s = -84 + 0
21 + -7s = -84

Add '-21' to each side of the equation.
21 + -21 + -7s = -84 + -21

Combine like terms: 21 + -21 = 0
0 + -7s = -84 + -21
-7s = -84 + -21

Combine like terms: -84 + -21 = -105
-7s = -105

Divide each side by '-7'.
s = 15

Simplifying
s = 15

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