13+5b-2b=21

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Solution for 13+5b-2b=21 equation: 


Simplifying
13 + 5b + -2b = 21

Combine like terms: 5b + -2b = 3b
13 + 3b = 21

Solving
13 + 3b = 21

Solving for variable 'b'.

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

Add '-13' to each side of the equation.
13 + -13 + 3b = 21 + -13

Combine like terms: 13 + -13 = 0
0 + 3b = 21 + -13
3b = 21 + -13

Combine like terms: 21 + -13 = 8
3b = 8

Divide each side by '3'.
b = 2.666666667

Simplifying
b = 2.666666667

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