21=5(d-7)-4

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Solution for 21=5(d-7)-4 equation:


Simplifying
21 = 5(d + -7) + -4

Reorder the terms:
21 = 5(-7 + d) + -4
21 = (-7 * 5 + d * 5) + -4
21 = (-35 + 5d) + -4

Reorder the terms:
21 = -35 + -4 + 5d

Combine like terms: -35 + -4 = -39
21 = -39 + 5d

Solving
21 = -39 + 5d

Solving for variable 'd'.

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

Add '-5d' to each side of the equation.
21 + -5d = -39 + 5d + -5d

Combine like terms: 5d + -5d = 0
21 + -5d = -39 + 0
21 + -5d = -39

Add '-21' to each side of the equation.
21 + -21 + -5d = -39 + -21

Combine like terms: 21 + -21 = 0
0 + -5d = -39 + -21
-5d = -39 + -21

Combine like terms: -39 + -21 = -60
-5d = -60

Divide each side by '-5'.
d = 12

Simplifying
d = 12

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