5d+9=8d-12

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Solution for 5d+9=8d-12 equation:


Simplifying
5d + 9 = 8d + -12

Reorder the terms:
9 + 5d = 8d + -12

Reorder the terms:
9 + 5d = -12 + 8d

Solving
9 + 5d = -12 + 8d

Solving for variable 'd'.

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

Add '-8d' to each side of the equation.
9 + 5d + -8d = -12 + 8d + -8d

Combine like terms: 5d + -8d = -3d
9 + -3d = -12 + 8d + -8d

Combine like terms: 8d + -8d = 0
9 + -3d = -12 + 0
9 + -3d = -12

Add '-9' to each side of the equation.
9 + -9 + -3d = -12 + -9

Combine like terms: 9 + -9 = 0
0 + -3d = -12 + -9
-3d = -12 + -9

Combine like terms: -12 + -9 = -21
-3d = -21

Divide each side by '-3'.
d = 7

Simplifying
d = 7

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