21b-13=71

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Solution for 21b-13=71 equation: 


Simplifying
21b + -13 = 71

Reorder the terms:
-13 + 21b = 71

Solving
-13 + 21b = 71

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 + 21b = 71 + 13

Combine like terms: -13 + 13 = 0
0 + 21b = 71 + 13
21b = 71 + 13

Combine like terms: 71 + 13 = 84
21b = 84

Divide each side by '21'.
b = 4

Simplifying
b = 4

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