-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 = -8b
-21 + -8b = -3 + 6b + -6b

Combine like terms: 6b + -6b = 0
-21 + -8b = -3 + 0
-21 + -8b = -3

Add '21' to each side of the equation.
-21 + 21 + -8b = -3 + 21

Combine like terms: -21 + 21 = 0
0 + -8b = -3 + 21
-8b = -3 + 21

Combine like terms: -3 + 21 = 18
-8b = 18

Divide each side by '-8'.
b = -2.25

Simplifying
b = -2.25

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