-3b+21=-9

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


Simplifying
-3b + 21 = -9

Reorder the terms:
21 + -3b = -9

Solving
21 + -3b = -9

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 + -3b = -9 + -21

Combine like terms: 21 + -21 = 0
0 + -3b = -9 + -21
-3b = -9 + -21

Combine like terms: -9 + -21 = -30
-3b = -30

Divide each side by '-3'.
b = 10

Simplifying
b = 10

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