n+d=90

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Solution for n+d=90 equation: 


Simplifying
n + d = 90

Reorder the terms:
d + n = 90

Solving
d + n = 90

Solving for variable 'd'.

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

Add '-1n' to each side of the equation.
d + n + -1n = 90 + -1n

Combine like terms: n + -1n = 0
d + 0 = 90 + -1n
d = 90 + -1n

Simplifying
d = 90 + -1n

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