3(1.2b+2.1)=22.5

Solution for 3(1.2b+2.1)=22.5 equation:

Simplifying
3(1.2b + 2.1) = 22.5

Reorder the terms:
3(2.1 + 1.2b) = 22.5
(2.1 * 3 + 1.2b * 3) = 22.5
(6.3 + 3.6b) = 22.5

Solving
6.3 + 3.6b = 22.5

Solving for variable 'b'.

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

Add '-6.3' to each side of the equation.
6.3 + -6.3 + 3.6b = 22.5 + -6.3

Combine like terms: 6.3 + -6.3 = 0.0
0.0 + 3.6b = 22.5 + -6.3
3.6b = 22.5 + -6.3

Combine like terms: 22.5 + -6.3 = 16.2
3.6b = 16.2

Divide each side by '3.6'.
b = 4.5

Simplifying
b = 4.5