-21+5b=-3(b+4)-b

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Solution for -21+5b=-3(b+4)-b equation:


Simplifying
-21 + 5b = -3(b + 4) + -1b

Reorder the terms:
-21 + 5b = -3(4 + b) + -1b
-21 + 5b = (4 * -3 + b * -3) + -1b
-21 + 5b = (-12 + -3b) + -1b

Combine like terms: -3b + -1b = -4b
-21 + 5b = -12 + -4b

Solving
-21 + 5b = -12 + -4b

Solving for variable 'b'.

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

Add '4b' to each side of the equation.
-21 + 5b + 4b = -12 + -4b + 4b

Combine like terms: 5b + 4b = 9b
-21 + 9b = -12 + -4b + 4b

Combine like terms: -4b + 4b = 0
-21 + 9b = -12 + 0
-21 + 9b = -12

Add '21' to each side of the equation.
-21 + 21 + 9b = -12 + 21

Combine like terms: -21 + 21 = 0
0 + 9b = -12 + 21
9b = -12 + 21

Combine like terms: -12 + 21 = 9
9b = 9

Divide each side by '9'.
b = 1

Simplifying
b = 1

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