d-50.00=0.80(d-100.00)

Solution for d-50.00=0.80(d-100.00) equation:

Simplifying
d + -50.00 = 0.80(d + -100.00)

Reorder the terms:
-50.00 + d = 0.80(d + -100.00)

Reorder the terms:
-50.00 + d = 0.80(-100.00 + d)
-50.00 + d = (-100.00 * 0.80 + d * 0.80)
-50.00 + d = (-80 + 0.80d)

Solving
-50.00 + d = -80 + 0.80d

Solving for variable 'd'.

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

Add '-0.80d' to each side of the equation.
-50.00 + d + -0.80d = -80 + 0.80d + -0.80d

Combine like terms: d + -0.80d = 0.2d
-50.00 + 0.2d = -80 + 0.80d + -0.80d

Combine like terms: 0.80d + -0.80d = 0.00
-50.00 + 0.2d = -80 + 0.00
-50.00 + 0.2d = -80

Add '50.00' to each side of the equation.
-50.00 + 50.00 + 0.2d = -80 + 50.00

Combine like terms: -50.00 + 50.00 = 0.00
0.00 + 0.2d = -80 + 50.00
0.2d = -80 + 50.00

Combine like terms: -80 + 50.00 = -30
0.2d = -30

Divide each side by '0.2'.
d = -150

Simplifying
d = -150