4(5+d)=80

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Solution for 4(5+d)=80 equation: 


Simplifying
4(5 + d) = 80
(5 * 4 + d * 4) = 80
(20 + 4d) = 80

Solving
20 + 4d = 80

Solving for variable 'd'.

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

Add '-20' to each side of the equation.
20 + -20 + 4d = 80 + -20

Combine like terms: 20 + -20 = 0
0 + 4d = 80 + -20
4d = 80 + -20

Combine like terms: 80 + -20 = 60
4d = 60

Divide each side by '4'.
d = 15

Simplifying
d = 15

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