b+21=2b+4

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Solution for b+21=2b+4 equation:


Simplifying
b + 21 = 2b + 4

Reorder the terms:
21 + b = 2b + 4

Reorder the terms:
21 + b = 4 + 2b

Solving
21 + b = 4 + 2b

Solving for variable 'b'.

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

Add '-2b' to each side of the equation.
21 + b + -2b = 4 + 2b + -2b

Combine like terms: b + -2b = -1b
21 + -1b = 4 + 2b + -2b

Combine like terms: 2b + -2b = 0
21 + -1b = 4 + 0
21 + -1b = 4

Add '-21' to each side of the equation.
21 + -21 + -1b = 4 + -21

Combine like terms: 21 + -21 = 0
0 + -1b = 4 + -21
-1b = 4 + -21

Combine like terms: 4 + -21 = -17
-1b = -17

Divide each side by '-1'.
b = 17

Simplifying
b = 17

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