15=d-13

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Solution for 15=d-13 equation:


Simplifying
15 = d + -13

Reorder the terms:
15 = -13 + d

Solving
15 = -13 + 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 = -13 + d + -1d

Combine like terms: d + -1d = 0
15 + -1d = -13 + 0
15 + -1d = -13

Add '-15' to each side of the equation.
15 + -15 + -1d = -13 + -15

Combine like terms: 15 + -15 = 0
0 + -1d = -13 + -15
-1d = -13 + -15

Combine like terms: -13 + -15 = -28
-1d = -28

Divide each side by '-1'.
d = 28

Simplifying
d = 28

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