3d-30=15+d

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Solution for 3d-30=15+d equation: 


Simplifying
3d + -30 = 15 + d

Reorder the terms:
-30 + 3d = 15 + d

Solving
-30 + 3d = 15 + d

Solving for variable 'd'.

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

Add '-1d' to each side of the equation.
-30 + 3d + -1d = 15 + d + -1d

Combine like terms: 3d + -1d = 2d
-30 + 2d = 15 + d + -1d

Combine like terms: d + -1d = 0
-30 + 2d = 15 + 0
-30 + 2d = 15

Add '30' to each side of the equation.
-30 + 30 + 2d = 15 + 30

Combine like terms: -30 + 30 = 0
0 + 2d = 15 + 30
2d = 15 + 30

Combine like terms: 15 + 30 = 45
2d = 45

Divide each side by '2'.
d = 22.5

Simplifying
d = 22.5

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