1+5+13-4-d=7

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Solution for 1+5+13-4-d=7 equation: 


Simplifying
1 + 5 + 13 + -4 + -1d = 7

Combine like terms: 1 + 5 = 6
6 + 13 + -4 + -1d = 7

Combine like terms: 6 + 13 = 19
19 + -4 + -1d = 7

Combine like terms: 19 + -4 = 15
15 + -1d = 7

Solving
15 + -1d = 7

Solving for variable 'd'.

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

Add '-15' to each side of the equation.
15 + -15 + -1d = 7 + -15

Combine like terms: 15 + -15 = 0
0 + -1d = 7 + -15
-1d = 7 + -15

Combine like terms: 7 + -15 = -8
-1d = -8

Divide each side by '-1'.
d = 8

Simplifying
d = 8

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