3(1.2b-1)+36=4.2

Solution for 3(1.2b-1)+36=4.2 equation:

Simplifying
3(1.2b + -1) + 36 = 4.2

Reorder the terms:
3(-1 + 1.2b) + 36 = 4.2
(-1 * 3 + 1.2b * 3) + 36 = 4.2
(-3 + 3.6b) + 36 = 4.2

Reorder the terms:
-3 + 36 + 3.6b = 4.2

Combine like terms: -3 + 36 = 33
33 + 3.6b = 4.2

Solving
33 + 3.6b = 4.2

Solving for variable 'b'.

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

Add '-33' to each side of the equation.
33 + -33 + 3.6b = 4.2 + -33

Combine like terms: 33 + -33 = 0
0 + 3.6b = 4.2 + -33
3.6b = 4.2 + -33

Combine like terms: 4.2 + -33 = -28.8
3.6b = -28.8

Divide each side by '3.6'.
b = -8

Simplifying
b = -8