25=1d+21

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Solution for 25=1d+21 equation:


Simplifying
25 = 1d + 21

Reorder the terms:
25 = 21 + 1d

Solving
25 = 21 + 1d

Solving for variable 'd'.

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

Add '-1d' to each side of the equation.
25 + -1d = 21 + 1d + -1d

Combine like terms: 1d + -1d = 0
25 + -1d = 21 + 0
25 + -1d = 21

Add '-25' to each side of the equation.
25 + -25 + -1d = 21 + -25

Combine like terms: 25 + -25 = 0
0 + -1d = 21 + -25
-1d = 21 + -25

Combine like terms: 21 + -25 = -4
-1d = -4

Divide each side by '-1'.
d = 4

Simplifying
d = 4

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