21=b-x-4x

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Solution for 21=b-x-4x equation:


Simplifying
21 = b + -1x + -4x

Combine like terms: -1x + -4x = -5x
21 = b + -5x

Solving
21 = b + -5x

Solving for variable 'b'.

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

Add '-1b' to each side of the equation.
21 + -1b = b + -1b + -5x

Combine like terms: b + -1b = 0
21 + -1b = 0 + -5x
21 + -1b = -5x

Add '-21' to each side of the equation.
21 + -21 + -1b = -21 + -5x

Combine like terms: 21 + -21 = 0
0 + -1b = -21 + -5x
-1b = -21 + -5x

Divide each side by '-1'.
b = 21 + 5x

Simplifying
b = 21 + 5x

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