12+(3+d)=31

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Solution for 12+(3+d)=31 equation: 


Simplifying
12 + (3 + d) = 31

Remove parenthesis around (3 + d)
12 + 3 + d = 31

Combine like terms: 12 + 3 = 15
15 + d = 31

Solving
15 + d = 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 + d = 31 + -15

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

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

Simplifying
d = 16

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