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

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


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

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

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

Solving for variable 'b'.

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

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

Combine like terms: -21 + 21 = 0
0 + -2b = 3 + 21 + -6n
-2b = 3 + 21 + -6n

Combine like terms: 3 + 21 = 24
-2b = 24 + -6n

Divide each side by '-2'.
b = -12 + 3n

Simplifying
b = -12 + 3n

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