d+3+3d=15

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Solution for d+3+3d=15 equation: 


Simplifying
d + 3 + 3d = 15

Reorder the terms:
3 + d + 3d = 15

Combine like terms: d + 3d = 4d
3 + 4d = 15

Solving
3 + 4d = 15

Solving for variable 'd'.

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

Add '-3' to each side of the equation.
3 + -3 + 4d = 15 + -3

Combine like terms: 3 + -3 = 0
0 + 4d = 15 + -3
4d = 15 + -3

Combine like terms: 15 + -3 = 12
4d = 12

Divide each side by '4'.
d = 3

Simplifying
d = 3

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