77=80-d

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Solution for 77=80-d equation:


Simplifying
77 = 80 + -1d

Solving
77 = 80 + -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.
77 + d = 80 + -1d + d

Combine like terms: -1d + d = 0
77 + d = 80 + 0
77 + d = 80

Add '-77' to each side of the equation.
77 + -77 + d = 80 + -77

Combine like terms: 77 + -77 = 0
0 + d = 80 + -77
d = 80 + -77

Combine like terms: 80 + -77 = 3
d = 3

Simplifying
d = 3

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