-6b-21=-3(3b-5)-6b

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Solution for -6b-21=-3(3b-5)-6b equation:


Simplifying
-6b + -21 = -3(3b + -5) + -6b

Reorder the terms:
-21 + -6b = -3(3b + -5) + -6b

Reorder the terms:
-21 + -6b = -3(-5 + 3b) + -6b
-21 + -6b = (-5 * -3 + 3b * -3) + -6b
-21 + -6b = (15 + -9b) + -6b

Combine like terms: -9b + -6b = -15b
-21 + -6b = 15 + -15b

Solving
-21 + -6b = 15 + -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 + -6b + 15b = 15 + -15b + 15b

Combine like terms: -6b + 15b = 9b
-21 + 9b = 15 + -15b + 15b

Combine like terms: -15b + 15b = 0
-21 + 9b = 15 + 0
-21 + 9b = 15

Add '21' to each side of the equation.
-21 + 21 + 9b = 15 + 21

Combine like terms: -21 + 21 = 0
0 + 9b = 15 + 21
9b = 15 + 21

Combine like terms: 15 + 21 = 36
9b = 36

Divide each side by '9'.
b = 4

Simplifying
b = 4

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