5d+(15+d)+d=120

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Solution for 5d+(15+d)+d=120 equation:


Simplifying
5d + (15 + d) + d = 120

Remove parenthesis around (15 + d)
5d + 15 + d + d = 120

Reorder the terms:
15 + 5d + d + d = 120

Combine like terms: 5d + d = 6d
15 + 6d + d = 120

Combine like terms: 6d + d = 7d
15 + 7d = 120

Solving
15 + 7d = 120

Solving for variable 'd'.

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

Add '-15' to each side of the equation.
15 + -15 + 7d = 120 + -15

Combine like terms: 15 + -15 = 0
0 + 7d = 120 + -15
7d = 120 + -15

Combine like terms: 120 + -15 = 105
7d = 105

Divide each side by '7'.
d = 15

Simplifying
d = 15

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