12+9=3d+4

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Solution for 12+9=3d+4 equation:


Simplifying
12 + 9 = 3d + 4

Combine like terms: 12 + 9 = 21
21 = 3d + 4

Reorder the terms:
21 = 4 + 3d

Solving
21 = 4 + 3d

Solving for variable 'd'.

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

Add '-3d' to each side of the equation.
21 + -3d = 4 + 3d + -3d

Combine like terms: 3d + -3d = 0
21 + -3d = 4 + 0
21 + -3d = 4

Add '-21' to each side of the equation.
21 + -21 + -3d = 4 + -21

Combine like terms: 21 + -21 = 0
0 + -3d = 4 + -21
-3d = 4 + -21

Combine like terms: 4 + -21 = -17
-3d = -17

Divide each side by '-3'.
d = 5.666666667

Simplifying
d = 5.666666667

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