20-d=13

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Solution for 20-d=13 equation: 


Simplifying
20 + -1d = 13

Solving
20 + -1d = 13

Solving for variable 'd'.

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

Add '-20' to each side of the equation.
20 + -20 + -1d = 13 + -20

Combine like terms: 20 + -20 = 0
0 + -1d = 13 + -20
-1d = 13 + -20

Combine like terms: 13 + -20 = -7
-1d = -7

Divide each side by '-1'.
d = 7

Simplifying
d = 7

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