18-21=15d+3d

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Solution for 18-21=15d+3d equation:


Simplifying
18 + -21 = 15d + 3d

Combine like terms: 18 + -21 = -3
-3 = 15d + 3d

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

Solving
-3 = 18d

Solving for variable 'd'.

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

Add '-18d' to each side of the equation.
-3 + -18d = 18d + -18d

Combine like terms: 18d + -18d = 0
-3 + -18d = 0

Add '3' to each side of the equation.
-3 + 3 + -18d = 0 + 3

Combine like terms: -3 + 3 = 0
0 + -18d = 0 + 3
-18d = 0 + 3

Combine like terms: 0 + 3 = 3
-18d = 3

Divide each side by '-18'.
d = -0.1666666667

Simplifying
d = -0.1666666667

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