80+d=120

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Solution for 80+d=120 equation: 


Simplifying
80 + d = 120

Solving
80 + d = 120

Solving for variable 'd'.

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

Add '-80' to each side of the equation.
80 + -80 + d = 120 + -80

Combine like terms: 80 + -80 = 0
0 + d = 120 + -80
d = 120 + -80

Combine like terms: 120 + -80 = 40
d = 40

Simplifying
d = 40

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