2.1b+12.99=21.39

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Solution for 2.1b+12.99=21.39 equation: 


Simplifying
2.1b + 12.99 = 21.39

Reorder the terms:
12.99 + 2.1b = 21.39

Solving
12.99 + 2.1b = 21.39

Solving for variable 'b'.

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

Add '-12.99' to each side of the equation.
12.99 + -12.99 + 2.1b = 21.39 + -12.99

Combine like terms: 12.99 + -12.99 = 0.00
0.00 + 2.1b = 21.39 + -12.99
2.1b = 21.39 + -12.99

Combine like terms: 21.39 + -12.99 = 8.4
2.1b = 8.4

Divide each side by '2.1'.
b = 4

Simplifying
b = 4

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