15(20+d)=420

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Solution for 15(20+d)=420 equation: 


Simplifying
15(20 + d) = 420
(20 * 15 + d * 15) = 420
(300 + 15d) = 420

Solving
300 + 15d = 420

Solving for variable 'd'.

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

Add '-300' to each side of the equation.
300 + -300 + 15d = 420 + -300

Combine like terms: 300 + -300 = 0
0 + 15d = 420 + -300
15d = 420 + -300

Combine like terms: 420 + -300 = 120
15d = 120

Divide each side by '15'.
d = 8

Simplifying
d = 8

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