72+(a+b)=180

Solution for 72+(a+b)=180 equation:

Simplifying
72 + (a + b) = 180

Remove parenthesis around (a + b)
72 + a + b = 180

Solving
72 + a + b = 180

Solving for variable 'a'.

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

Add '-72' to each side of the equation.
72 + a + -72 + b = 180 + -72

Reorder the terms:
72 + -72 + a + b = 180 + -72

Combine like terms: 72 + -72 = 0
0 + a + b = 180 + -72
a + b = 180 + -72

Combine like terms: 180 + -72 = 108
a + b = 108

Add '-1b' to each side of the equation.
a + b + -1b = 108 + -1b

Combine like terms: b + -1b = 0
a + 0 = 108 + -1b
a = 108 + -1b

Simplifying
a = 108 + -1b