15-4d=31

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Solution for 15-4d=31 equation: 


Simplifying
15 + -4d = 31

Solving
15 + -4d = 31

Solving for variable 'd'.

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

Add '-15' to each side of the equation.
15 + -15 + -4d = 31 + -15

Combine like terms: 15 + -15 = 0
0 + -4d = 31 + -15
-4d = 31 + -15

Combine like terms: 31 + -15 = 16
-4d = 16

Divide each side by '-4'.
d = -4

Simplifying
d = -4

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