2b+5+3b=b+21

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Solution for 2b+5+3b=b+21 equation:


Simplifying
2b + 5 + 3b = b + 21

Reorder the terms:
5 + 2b + 3b = b + 21

Combine like terms: 2b + 3b = 5b
5 + 5b = b + 21

Reorder the terms:
5 + 5b = 21 + b

Solving
5 + 5b = 21 + b

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.
5 + 5b + -1b = 21 + b + -1b

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

Combine like terms: b + -1b = 0
5 + 4b = 21 + 0
5 + 4b = 21

Add '-5' to each side of the equation.
5 + -5 + 4b = 21 + -5

Combine like terms: 5 + -5 = 0
0 + 4b = 21 + -5
4b = 21 + -5

Combine like terms: 21 + -5 = 16
4b = 16

Divide each side by '4'.
b = 4

Simplifying
b = 4

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