8d-9-3d=31

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Solution for 8d-9-3d=31 equation: 


Simplifying
8d + -9 + -3d = 31

Reorder the terms:
-9 + 8d + -3d = 31

Combine like terms: 8d + -3d = 5d
-9 + 5d = 31

Solving
-9 + 5d = 31

Solving for variable 'd'.

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

Add '9' to each side of the equation.
-9 + 9 + 5d = 31 + 9

Combine like terms: -9 + 9 = 0
0 + 5d = 31 + 9
5d = 31 + 9

Combine like terms: 31 + 9 = 40
5d = 40

Divide each side by '5'.
d = 8

Simplifying
d = 8

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