20=-d+9

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Solution for 20=-d+9 equation:


Simplifying
20 = -1d + 9

Reorder the terms:
20 = 9 + -1d

Solving
20 = 9 + -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.
20 + d = 9 + -1d + d

Combine like terms: -1d + d = 0
20 + d = 9 + 0
20 + d = 9

Add '-20' to each side of the equation.
20 + -20 + d = 9 + -20

Combine like terms: 20 + -20 = 0
0 + d = 9 + -20
d = 9 + -20

Combine like terms: 9 + -20 = -11
d = -11

Simplifying
d = -11

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