20=100-4d

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Solution for 20=100-4d equation:


Simplifying
20 = 100 + -4d

Solving
20 = 100 + -4d

Solving for variable 'd'.

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

Add '4d' to each side of the equation.
20 + 4d = 100 + -4d + 4d

Combine like terms: -4d + 4d = 0
20 + 4d = 100 + 0
20 + 4d = 100

Add '-20' to each side of the equation.
20 + -20 + 4d = 100 + -20

Combine like terms: 20 + -20 = 0
0 + 4d = 100 + -20
4d = 100 + -20

Combine like terms: 100 + -20 = 80
4d = 80

Divide each side by '4'.
d = 20

Simplifying
d = 20

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