54=4+(21-1)d

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


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

Combine like terms: 21 + -1 = 20
54 = 4 + (20) * d

Solving
54 = 4 + 20d

Solving for variable 'd'.

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

Add '-20d' to each side of the equation.
54 + -20d = 4 + 20d + -20d

Combine like terms: 20d + -20d = 0
54 + -20d = 4 + 0
54 + -20d = 4

Add '-54' to each side of the equation.
54 + -54 + -20d = 4 + -54

Combine like terms: 54 + -54 = 0
0 + -20d = 4 + -54
-20d = 4 + -54

Combine like terms: 4 + -54 = -50
-20d = -50

Divide each side by '-20'.
d = 2.5

Simplifying
d = 2.5

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