3=15-3d

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Solution for 3=15-3d equation:


Simplifying
3 = 15 + -3d

Solving
3 = 15 + -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.
3 + 3d = 15 + -3d + 3d

Combine like terms: -3d + 3d = 0
3 + 3d = 15 + 0
3 + 3d = 15

Add '-3' to each side of the equation.
3 + -3 + 3d = 15 + -3

Combine like terms: 3 + -3 = 0
0 + 3d = 15 + -3
3d = 15 + -3

Combine like terms: 15 + -3 = 12
3d = 12

Divide each side by '3'.
d = 4

Simplifying
d = 4

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