19.5+22.7+14.4+d=77

Solution for 19.5+22.7+14.4+d=77 equation:

Simplifying
19.5 + 22.7 + 14.4 + d = 77

Combine like terms: 19.5 + 22.7 = 42.2
42.2 + 14.4 + d = 77

Combine like terms: 42.2 + 14.4 = 56.6
56.6 + d = 77

Solving
56.6 + d = 77

Solving for variable 'd'.

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

Add '-56.6' to each side of the equation.
56.6 + -56.6 + d = 77 + -56.6

Combine like terms: 56.6 + -56.6 = 0.0
0.0 + d = 77 + -56.6
d = 77 + -56.6

Combine like terms: 77 + -56.6 = 20.4
d = 20.4

Simplifying
d = 20.4