21=3s+4b

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Solution for 21=3s+4b equation:


Simplifying
21 = 3s + 4b

Reorder the terms:
21 = 4b + 3s

Solving
21 = 4b + 3s

Solving for variable 'b'.

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

Add '-4b' to each side of the equation.
21 + -4b = 4b + -4b + 3s

Combine like terms: 4b + -4b = 0
21 + -4b = 0 + 3s
21 + -4b = 3s

Add '-21' to each side of the equation.
21 + -21 + -4b = -21 + 3s

Combine like terms: 21 + -21 = 0
0 + -4b = -21 + 3s
-4b = -21 + 3s

Divide each side by '-4'.
b = 5.25 + -0.75s

Simplifying
b = 5.25 + -0.75s

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