15-d=20

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Solution for 15-d=20 equation: 


Simplifying
15 + -1d = 20

Solving
15 + -1d = 20

Solving for variable 'd'.

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

Add '-15' to each side of the equation.
15 + -15 + -1d = 20 + -15

Combine like terms: 15 + -15 = 0
0 + -1d = 20 + -15
-1d = 20 + -15

Combine like terms: 20 + -15 = 5
-1d = 5

Divide each side by '-1'.
d = -5

Simplifying
d = -5

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