21=8(5d+7)

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Solution for 21=8(5d+7) equation:


Simplifying
21 = 8(5d + 7)

Reorder the terms:
21 = 8(7 + 5d)
21 = (7 * 8 + 5d * 8)
21 = (56 + 40d)

Solving
21 = 56 + 40d

Solving for variable 'd'.

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

Add '-40d' to each side of the equation.
21 + -40d = 56 + 40d + -40d

Combine like terms: 40d + -40d = 0
21 + -40d = 56 + 0
21 + -40d = 56

Add '-21' to each side of the equation.
21 + -21 + -40d = 56 + -21

Combine like terms: 21 + -21 = 0
0 + -40d = 56 + -21
-40d = 56 + -21

Combine like terms: 56 + -21 = 35
-40d = 35

Divide each side by '-40'.
d = -0.875

Simplifying
d = -0.875

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