15=3(d+1)

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Solution for 15=3(d+1) equation:


Simplifying
15 = 3(d + 1)

Reorder the terms:
15 = 3(1 + d)
15 = (1 * 3 + d * 3)
15 = (3 + 3d)

Solving
15 = 3 + 3d

Solving for variable 'd'.

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

Add '-3d' to each side of the equation.
15 + -3d = 3 + 3d + -3d

Combine like terms: 3d + -3d = 0
15 + -3d = 3 + 0
15 + -3d = 3

Add '-15' to each side of the equation.
15 + -15 + -3d = 3 + -15

Combine like terms: 15 + -15 = 0
0 + -3d = 3 + -15
-3d = 3 + -15

Combine like terms: 3 + -15 = -12
-3d = -12

Divide each side by '-3'.
d = 4

Simplifying
d = 4

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