3rb+21=15

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Solution for 3rb+21=15 equation: 


Simplifying
3rb + 21 = 15

Reorder the terms:
21 + 3br = 15

Solving
21 + 3br = 15

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 + 3br = 15 + -21

Combine like terms: 21 + -21 = 0
0 + 3br = 15 + -21
3br = 15 + -21

Combine like terms: 15 + -21 = -6
3br = -6

Divide each side by '3r'.
b = -2r-1

Simplifying
b = -2r-1

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