-12-15d+18d=-15

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Solution for -12-15d+18d=-15 equation: 


Simplifying
-12 + -15d + 18d = -15

Combine like terms: -15d + 18d = 3d
-12 + 3d = -15

Solving
-12 + 3d = -15

Solving for variable 'd'.

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

Add '12' to each side of the equation.
-12 + 12 + 3d = -15 + 12

Combine like terms: -12 + 12 = 0
0 + 3d = -15 + 12
3d = -15 + 12

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

Divide each side by '3'.
d = -1

Simplifying
d = -1

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