d+9=-12

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Solution for d+9=-12 equation: 


Simplifying
d + 9 = -12

Reorder the terms:
9 + d = -12

Solving
9 + d = -12

Solving for variable 'd'.

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

Add '-9' to each side of the equation.
9 + -9 + d = -12 + -9

Combine like terms: 9 + -9 = 0
0 + d = -12 + -9
d = -12 + -9

Combine like terms: -12 + -9 = -21
d = -21

Simplifying
d = -21

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