21=4+(54-1)d

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Solution for 21=4+(54-1)d equation: 


Simplifying
21 = 4 + (54 + -1) * d

Combine like terms: 54 + -1 = 53
21 = 4 + (53) * d

Solving
21 = 4 + 53d

Solving for variable 'd'.

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

Add '-53d' to each side of the equation.
21 + -53d = 4 + 53d + -53d

Combine like terms: 53d + -53d = 0
21 + -53d = 4 + 0
21 + -53d = 4

Add '-21' to each side of the equation.
21 + -21 + -53d = 4 + -21

Combine like terms: 21 + -21 = 0
0 + -53d = 4 + -21
-53d = 4 + -21

Combine like terms: 4 + -21 = -17
-53d = -17

Divide each side by '-53'.
d = 0.320754717

Simplifying
d = 0.320754717

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