-20-7d-20=-5(-5d-20)+20

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Solution for -20-7d-20=-5(-5d-20)+20 equation:


Simplifying
-20 + -7d + -20 = -5(-5d + -20) + 20

Reorder the terms:
-20 + -20 + -7d = -5(-5d + -20) + 20

Combine like terms: -20 + -20 = -40
-40 + -7d = -5(-5d + -20) + 20

Reorder the terms:
-40 + -7d = -5(-20 + -5d) + 20
-40 + -7d = (-20 * -5 + -5d * -5) + 20
-40 + -7d = (100 + 25d) + 20

Reorder the terms:
-40 + -7d = 100 + 20 + 25d

Combine like terms: 100 + 20 = 120
-40 + -7d = 120 + 25d

Solving
-40 + -7d = 120 + 25d

Solving for variable 'd'.

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

Add '-25d' to each side of the equation.
-40 + -7d + -25d = 120 + 25d + -25d

Combine like terms: -7d + -25d = -32d
-40 + -32d = 120 + 25d + -25d

Combine like terms: 25d + -25d = 0
-40 + -32d = 120 + 0
-40 + -32d = 120

Add '40' to each side of the equation.
-40 + 40 + -32d = 120 + 40

Combine like terms: -40 + 40 = 0
0 + -32d = 120 + 40
-32d = 120 + 40

Combine like terms: 120 + 40 = 160
-32d = 160

Divide each side by '-32'.
d = -5

Simplifying
d = -5

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