72=100-d

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Solution for 72=100-d equation:


Simplifying
72 = 100 + -1d

Solving
72 = 100 + -1d

Solving for variable 'd'.

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

Add 'd' to each side of the equation.
72 + d = 100 + -1d + d

Combine like terms: -1d + d = 0
72 + d = 100 + 0
72 + d = 100

Add '-72' to each side of the equation.
72 + -72 + d = 100 + -72

Combine like terms: 72 + -72 = 0
0 + d = 100 + -72
d = 100 + -72

Combine like terms: 100 + -72 = 28
d = 28

Simplifying
d = 28

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