3b+5b-3=21

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Solution for 3b+5b-3=21 equation: 


Simplifying
3b + 5b + -3 = 21

Reorder the terms:
-3 + 3b + 5b = 21

Combine like terms: 3b + 5b = 8b
-3 + 8b = 21

Solving
-3 + 8b = 21

Solving for variable 'b'.

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

Add '3' to each side of the equation.
-3 + 3 + 8b = 21 + 3

Combine like terms: -3 + 3 = 0
0 + 8b = 21 + 3
8b = 21 + 3

Combine like terms: 21 + 3 = 24
8b = 24

Divide each side by '8'.
b = 3

Simplifying
b = 3

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