12d+15=7d

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Solution for 12d+15=7d equation:


Simplifying
12d + 15 = 7d

Reorder the terms:
15 + 12d = 7d

Solving
15 + 12d = 7d

Solving for variable 'd'.

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

Add '-7d' to each side of the equation.
15 + 12d + -7d = 7d + -7d

Combine like terms: 12d + -7d = 5d
15 + 5d = 7d + -7d

Combine like terms: 7d + -7d = 0
15 + 5d = 0

Add '-15' to each side of the equation.
15 + -15 + 5d = 0 + -15

Combine like terms: 15 + -15 = 0
0 + 5d = 0 + -15
5d = 0 + -15

Combine like terms: 0 + -15 = -15
5d = -15

Divide each side by '5'.
d = -3

Simplifying
d = -3

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