(1.0)(0.30-d)=(0.50)(d)

Solution for (1.0)(0.30-d)=(0.50)(d) equation:

Simplifying
(1.0)(0.30 + -1d) = (0.50)(d)
(0.30 * 1.0 + -1d * 1.0) = (0.50)(d)
(0.3 + -1d) = (0.50)(d)

Solving
0.3 + -1d = 0.50d

Solving for variable 'd'.

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

Add '-0.50d' to each side of the equation.
0.3 + -1d + -0.50d = 0.50d + -0.50d

Combine like terms: -1d + -0.50d = -1.5d
0.3 + -1.5d = 0.50d + -0.50d

Combine like terms: 0.50d + -0.50d = 0.00
0.3 + -1.5d = 0.00

Add '-0.3' to each side of the equation.
0.3 + -0.3 + -1.5d = 0.00 + -0.3

Combine like terms: 0.3 + -0.3 = 0.0
0.0 + -1.5d = 0.00 + -0.3
-1.5d = 0.00 + -0.3

Combine like terms: 0.00 + -0.3 = -0.3
-1.5d = -0.3

Divide each side by '-1.5'.
d = 0.2

Simplifying
d = 0.2