15d-1-11=7d-20

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Solution for 15d-1-11=7d-20 equation:


Simplifying
15d + -1 + -11 = 7d + -20

Reorder the terms:
-1 + -11 + 15d = 7d + -20

Combine like terms: -1 + -11 = -12
-12 + 15d = 7d + -20

Reorder the terms:
-12 + 15d = -20 + 7d

Solving
-12 + 15d = -20 + 7d

Solving for variable 'd'.

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

Add '-7d' to each side of the equation.
-12 + 15d + -7d = -20 + 7d + -7d

Combine like terms: 15d + -7d = 8d
-12 + 8d = -20 + 7d + -7d

Combine like terms: 7d + -7d = 0
-12 + 8d = -20 + 0
-12 + 8d = -20

Add '12' to each side of the equation.
-12 + 12 + 8d = -20 + 12

Combine like terms: -12 + 12 = 0
0 + 8d = -20 + 12
8d = -20 + 12

Combine like terms: -20 + 12 = -8
8d = -8

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

Simplifying
d = -1

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