21+7b=-8b-3(-6b-5)

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Solution for 21+7b=-8b-3(-6b-5) equation:


Simplifying
21 + 7b = -8b + -3(-6b + -5)

Reorder the terms:
21 + 7b = -8b + -3(-5 + -6b)
21 + 7b = -8b + (-5 * -3 + -6b * -3)
21 + 7b = -8b + (15 + 18b)

Reorder the terms:
21 + 7b = 15 + -8b + 18b

Combine like terms: -8b + 18b = 10b
21 + 7b = 15 + 10b

Solving
21 + 7b = 15 + 10b

Solving for variable 'b'.

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

Add '-10b' to each side of the equation.
21 + 7b + -10b = 15 + 10b + -10b

Combine like terms: 7b + -10b = -3b
21 + -3b = 15 + 10b + -10b

Combine like terms: 10b + -10b = 0
21 + -3b = 15 + 0
21 + -3b = 15

Add '-21' to each side of the equation.
21 + -21 + -3b = 15 + -21

Combine like terms: 21 + -21 = 0
0 + -3b = 15 + -21
-3b = 15 + -21

Combine like terms: 15 + -21 = -6
-3b = -6

Divide each side by '-3'.
b = 2

Simplifying
b = 2

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