13=-d+9

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Solution for 13=-d+9 equation:


Simplifying
13 = -1d + 9

Reorder the terms:
13 = 9 + -1d

Solving
13 = 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.
13 + d = 9 + -1d + d

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

Add '-13' to each side of the equation.
13 + -13 + d = 9 + -13

Combine like terms: 13 + -13 = 0
0 + d = 9 + -13
d = 9 + -13

Combine like terms: 9 + -13 = -4
d = -4

Simplifying
d = -4

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