2.4(d+4)=21.9

Solution for 2.4(d+4)=21.9 equation:

Simplifying
2.4(d + 4) = 21.9

Reorder the terms:
2.4(4 + d) = 21.9
(4 * 2.4 + d * 2.4) = 21.9
(9.6 + 2.4d) = 21.9

Solving
9.6 + 2.4d = 21.9

Solving for variable 'd'.

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

Add '-9.6' to each side of the equation.
9.6 + -9.6 + 2.4d = 21.9 + -9.6

Combine like terms: 9.6 + -9.6 = 0.0
0.0 + 2.4d = 21.9 + -9.6
2.4d = 21.9 + -9.6

Combine like terms: 21.9 + -9.6 = 12.3
2.4d = 12.3

Divide each side by '2.4'.
d = 5.125

Simplifying
d = 5.125