-21=3b-9b

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Solution for -21=3b-9b equation:


Simplifying
-21 = 3b + -9b

Combine like terms: 3b + -9b = -6b
-21 = -6b

Solving
-21 = -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 + 6b = -6b + 6b

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

Add '21' to each side of the equation.
-21 + 21 + 6b = 0 + 21

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

Combine like terms: 0 + 21 = 21
6b = 21

Divide each side by '6'.
b = 3.5

Simplifying
b = 3.5

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