-21=-8+9(d-7)

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Solution for -21=-8+9(d-7) equation:


Simplifying
-21 = -8 + 9(d + -7)

Reorder the terms:
-21 = -8 + 9(-7 + d)
-21 = -8 + (-7 * 9 + d * 9)
-21 = -8 + (-63 + 9d)

Combine like terms: -8 + -63 = -71
-21 = -71 + 9d

Solving
-21 = -71 + 9d

Solving for variable 'd'.

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

Add '-9d' to each side of the equation.
-21 + -9d = -71 + 9d + -9d

Combine like terms: 9d + -9d = 0
-21 + -9d = -71 + 0
-21 + -9d = -71

Add '21' to each side of the equation.
-21 + 21 + -9d = -71 + 21

Combine like terms: -21 + 21 = 0
0 + -9d = -71 + 21
-9d = -71 + 21

Combine like terms: -71 + 21 = -50
-9d = -50

Divide each side by '-9'.
d = 5.555555556

Simplifying
d = 5.555555556

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