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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