7d-18=31

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Solution for 7d-18=31 equation: 


Simplifying
7d + -18 = 31

Reorder the terms:
-18 + 7d = 31

Solving
-18 + 7d = 31

Solving for variable 'd'.

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

Add '18' to each side of the equation.
-18 + 18 + 7d = 31 + 18

Combine like terms: -18 + 18 = 0
0 + 7d = 31 + 18
7d = 31 + 18

Combine like terms: 31 + 18 = 49
7d = 49

Divide each side by '7'.
d = 7

Simplifying
d = 7

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