21(b-1)+9=3(7b-4)b

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Solution for 21(b-1)+9=3(7b-4)b equation:


Simplifying
21(b + -1) + 9 = 3(7b + -4) * b

Reorder the terms:
21(-1 + b) + 9 = 3(7b + -4) * b
(-1 * 21 + b * 21) + 9 = 3(7b + -4) * b
(-21 + 21b) + 9 = 3(7b + -4) * b

Reorder the terms:
-21 + 9 + 21b = 3(7b + -4) * b

Combine like terms: -21 + 9 = -12
-12 + 21b = 3(7b + -4) * b

Reorder the terms:
-12 + 21b = 3(-4 + 7b) * b

Reorder the terms for easier multiplication:
-12 + 21b = 3b(-4 + 7b)
-12 + 21b = (-4 * 3b + 7b * 3b)
-12 + 21b = (-12b + 21b2)

Solving
-12 + 21b = -12b + 21b2

Solving for variable 'b'.

Combine like terms: 21b + 12b = 33b
-12 + 33b + -21b2 = -12b + 21b2 + 12b + -21b2

Reorder the terms:
-12 + 33b + -21b2 = -12b + 12b + 21b2 + -21b2

Combine like terms: -12b + 12b = 0
-12 + 33b + -21b2 = 0 + 21b2 + -21b2
-12 + 33b + -21b2 = 21b2 + -21b2

Combine like terms: 21b2 + -21b2 = 0
-12 + 33b + -21b2 = 0

Factor out the Greatest Common Factor (GCF), '3'.
3(-4 + 11b + -7b2) = 0

Factor a trinomial.
3((-1 + b)(4 + -7b)) = 0

Ignore the factor 3.

Subproblem 1

Set the factor '(-1 + b)' equal to zero and attempt to solve: Simplifying -1 + b = 0 Solving -1 + b = 0 Move all terms containing b to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + b = 0 + 1 Combine like terms: -1 + 1 = 0 0 + b = 0 + 1 b = 0 + 1 Combine like terms: 0 + 1 = 1 b = 1 Simplifying b = 1

Subproblem 2

Set the factor '(4 + -7b)' equal to zero and attempt to solve: Simplifying 4 + -7b = 0 Solving 4 + -7b = 0 Move all terms containing b to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + -7b = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -7b = 0 + -4 -7b = 0 + -4 Combine like terms: 0 + -4 = -4 -7b = -4 Divide each side by '-7'. b = 0.5714285714 Simplifying b = 0.5714285714

Solution

b = {1, 0.5714285714}

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