15=-d+20

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Solution for 15=-d+20 equation:


Simplifying
15 = -1d + 20

Reorder the terms:
15 = 20 + -1d

Solving
15 = 20 + -1d

Solving for variable 'd'.

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

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

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

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

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

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

Simplifying
d = 5

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