9d-8+4d=31

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Solution for 9d-8+4d=31 equation:


Simplifying
9d + -8 + 4d = 31

Reorder the terms:
-8 + 9d + 4d = 31

Combine like terms: 9d + 4d = 13d
-8 + 13d = 31

Solving
-8 + 13d = 31

Solving for variable 'd'.

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

Add '8' to each side of the equation.
-8 + 8 + 13d = 31 + 8

Combine like terms: -8 + 8 = 0
0 + 13d = 31 + 8
13d = 31 + 8

Combine like terms: 31 + 8 = 39
13d = 39

Divide each side by '13'.
d = 3

Simplifying
d = 3

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