21=(3b-11)+(b+4)

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Solution for 21=(3b-11)+(b+4) equation:


Simplifying
21 = (3b + -11) + (b + 4)

Reorder the terms:
21 = (-11 + 3b) + (b + 4)

Remove parenthesis around (-11 + 3b)
21 = -11 + 3b + (b + 4)

Reorder the terms:
21 = -11 + 3b + (4 + b)

Remove parenthesis around (4 + b)
21 = -11 + 3b + 4 + b

Reorder the terms:
21 = -11 + 4 + 3b + b

Combine like terms: -11 + 4 = -7
21 = -7 + 3b + b

Combine like terms: 3b + b = 4b
21 = -7 + 4b

Solving
21 = -7 + 4b

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 = -7 + 4b + -4b

Combine like terms: 4b + -4b = 0
21 + -4b = -7 + 0
21 + -4b = -7

Add '-21' to each side of the equation.
21 + -21 + -4b = -7 + -21

Combine like terms: 21 + -21 = 0
0 + -4b = -7 + -21
-4b = -7 + -21

Combine like terms: -7 + -21 = -28
-4b = -28

Divide each side by '-4'.
b = 7

Simplifying
b = 7

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