72=4(3+b)

Solution for 72=4(3+b) equation:

Simplifying
72 = 4(3 + b)
72 = (3 * 4 + b * 4)
72 = (12 + 4b)

Solving
72 = 12 + 4b

Solving for variable 'b'.

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

Add '-4b' to each side of the equation.
72 + -4b = 12 + 4b + -4b

Combine like terms: 4b + -4b = 0
72 + -4b = 12 + 0
72 + -4b = 12

Add '-72' to each side of the equation.
72 + -72 + -4b = 12 + -72

Combine like terms: 72 + -72 = 0
0 + -4b = 12 + -72
-4b = 12 + -72

Combine like terms: 12 + -72 = -60
-4b = -60

Divide each side by '-4'.
b = 15

Simplifying
b = 15