15-d-d=9-d

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Solution for 15-d-d=9-d equation:


Simplifying
15 + -1d + -1d = 9 + -1d

Combine like terms: -1d + -1d = -2d
15 + -2d = 9 + -1d

Solving
15 + -2d = 9 + -1d

Solving for variable 'd'.

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

Add 'd' to each side of the equation.
15 + -2d + d = 9 + -1d + d

Combine like terms: -2d + d = -1d
15 + -1d = 9 + -1d + d

Combine like terms: -1d + d = 0
15 + -1d = 9 + 0
15 + -1d = 9

Add '-15' to each side of the equation.
15 + -15 + -1d = 9 + -15

Combine like terms: 15 + -15 = 0
0 + -1d = 9 + -15
-1d = 9 + -15

Combine like terms: 9 + -15 = -6
-1d = -6

Divide each side by '-1'.
d = 6

Simplifying
d = 6

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