15=6+d

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Solution for 15=6+d equation:


Simplifying
15 = 6 + d

Solving
15 = 6 + d

Solving for variable 'd'.

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

Add '-1d' to each side of the equation.
15 + -1d = 6 + d + -1d

Combine like terms: d + -1d = 0
15 + -1d = 6 + 0
15 + -1d = 6

Add '-15' to each side of the equation.
15 + -15 + -1d = 6 + -15

Combine like terms: 15 + -15 = 0
0 + -1d = 6 + -15
-1d = 6 + -15

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

Divide each side by '-1'.
d = 9

Simplifying
d = 9

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