4b+21=b+7(2b-8)

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Solution for 4b+21=b+7(2b-8) equation:


Simplifying
4b + 21 = b + 7(2b + -8)

Reorder the terms:
21 + 4b = b + 7(2b + -8)

Reorder the terms:
21 + 4b = b + 7(-8 + 2b)
21 + 4b = b + (-8 * 7 + 2b * 7)
21 + 4b = b + (-56 + 14b)

Reorder the terms:
21 + 4b = -56 + b + 14b

Combine like terms: b + 14b = 15b
21 + 4b = -56 + 15b

Solving
21 + 4b = -56 + 15b

Solving for variable 'b'.

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

Add '-15b' to each side of the equation.
21 + 4b + -15b = -56 + 15b + -15b

Combine like terms: 4b + -15b = -11b
21 + -11b = -56 + 15b + -15b

Combine like terms: 15b + -15b = 0
21 + -11b = -56 + 0
21 + -11b = -56

Add '-21' to each side of the equation.
21 + -21 + -11b = -56 + -21

Combine like terms: 21 + -21 = 0
0 + -11b = -56 + -21
-11b = -56 + -21

Combine like terms: -56 + -21 = -77
-11b = -77

Divide each side by '-11'.
b = 7

Simplifying
b = 7

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