-21-2b=-3(2b-1)

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Solution for -21-2b=-3(2b-1) equation:


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

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

Solving
-21 + -2b = 3 + -6b

Solving for variable 'b'.

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

Add '6b' to each side of the equation.
-21 + -2b + 6b = 3 + -6b + 6b

Combine like terms: -2b + 6b = 4b
-21 + 4b = 3 + -6b + 6b

Combine like terms: -6b + 6b = 0
-21 + 4b = 3 + 0
-21 + 4b = 3

Add '21' to each side of the equation.
-21 + 21 + 4b = 3 + 21

Combine like terms: -21 + 21 = 0
0 + 4b = 3 + 21
4b = 3 + 21

Combine like terms: 3 + 21 = 24
4b = 24

Divide each side by '4'.
b = 6

Simplifying
b = 6

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