0=3b-21

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Solution for 0=3b-21 equation: 


Simplifying
0 = 3b + -21

Reorder the terms:
0 = -21 + 3b

Solving
0 = -21 + 3b

Solving for variable 'b'.

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

Add '-3b' to each side of the equation.
0 + -3b = -21 + 3b + -3b
Remove the zero:
-3b = -21 + 3b + -3b

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

Divide each side by '-3'.
b = 7

Simplifying
b = 7

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