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

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


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

Reorder the terms:
-21 = 6b + -3(6 + b)
-21 = 6b + (6 * -3 + b * -3)
-21 = 6b + (-18 + -3b)

Reorder the terms:
-21 = -18 + 6b + -3b

Combine like terms: 6b + -3b = 3b
-21 = -18 + 3b

Solving
-21 = -18 + 3b

Solving for variable 'b'.

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

Add '-3b' to each side of the equation.
-21 + -3b = -18 + 3b + -3b

Combine like terms: 3b + -3b = 0
-21 + -3b = -18 + 0
-21 + -3b = -18

Add '21' to each side of the equation.
-21 + 21 + -3b = -18 + 21

Combine like terms: -21 + 21 = 0
0 + -3b = -18 + 21
-3b = -18 + 21

Combine like terms: -18 + 21 = 3
-3b = 3

Divide each side by '-3'.
b = -1

Simplifying
b = -1

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