57-3b=21

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Solution for 57-3b=21 equation: 


Simplifying
57 + -3b = 21

Solving
57 + -3b = 21

Solving for variable 'b'.

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

Add '-57' to each side of the equation.
57 + -57 + -3b = 21 + -57

Combine like terms: 57 + -57 = 0
0 + -3b = 21 + -57
-3b = 21 + -57

Combine like terms: 21 + -57 = -36
-3b = -36

Divide each side by '-3'.
b = 12

Simplifying
b = 12

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