9(d+1)=-18

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Solution for 9(d+1)=-18 equation: 


Simplifying
9(d + 1) = -18

Reorder the terms:
9(1 + d) = -18
(1 * 9 + d * 9) = -18
(9 + 9d) = -18

Solving
9 + 9d = -18

Solving for variable 'd'.

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

Add '-9' to each side of the equation.
9 + -9 + 9d = -18 + -9

Combine like terms: 9 + -9 = 0
0 + 9d = -18 + -9
9d = -18 + -9

Combine like terms: -18 + -9 = -27
9d = -27

Divide each side by '9'.
d = -3

Simplifying
d = -3

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