-21-b=6(2b+3)

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Solution for -21-b=6(2b+3) equation:


Simplifying
-21 + -1b = 6(2b + 3)

Reorder the terms:
-21 + -1b = 6(3 + 2b)
-21 + -1b = (3 * 6 + 2b * 6)
-21 + -1b = (18 + 12b)

Solving
-21 + -1b = 18 + 12b

Solving for variable 'b'.

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

Add '-12b' to each side of the equation.
-21 + -1b + -12b = 18 + 12b + -12b

Combine like terms: -1b + -12b = -13b
-21 + -13b = 18 + 12b + -12b

Combine like terms: 12b + -12b = 0
-21 + -13b = 18 + 0
-21 + -13b = 18

Add '21' to each side of the equation.
-21 + 21 + -13b = 18 + 21

Combine like terms: -21 + 21 = 0
0 + -13b = 18 + 21
-13b = 18 + 21

Combine like terms: 18 + 21 = 39
-13b = 39

Divide each side by '-13'.
b = -3

Simplifying
b = -3

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