4d+9=12

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Solution for 4d+9=12 equation: 


Simplifying
4d + 9 = 12

Reorder the terms:
9 + 4d = 12

Solving
9 + 4d = 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 + 4d = 12 + -9

Combine like terms: 9 + -9 = 0
0 + 4d = 12 + -9
4d = 12 + -9

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

Divide each side by '4'.
d = 0.75

Simplifying
d = 0.75

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