19=20-7d-d

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Solution for 19=20-7d-d equation:


Simplifying
19 = 20 + -7d + -1d

Combine like terms: -7d + -1d = -8d
19 = 20 + -8d

Solving
19 = 20 + -8d

Solving for variable 'd'.

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

Add '8d' to each side of the equation.
19 + 8d = 20 + -8d + 8d

Combine like terms: -8d + 8d = 0
19 + 8d = 20 + 0
19 + 8d = 20

Add '-19' to each side of the equation.
19 + -19 + 8d = 20 + -19

Combine like terms: 19 + -19 = 0
0 + 8d = 20 + -19
8d = 20 + -19

Combine like terms: 20 + -19 = 1
8d = 1

Divide each side by '8'.
d = 0.125

Simplifying
d = 0.125

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