9(x+d)=21

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Solution for 9(x+d)=21 equation: 


Simplifying
9(x + d) = 21

Reorder the terms:
9(d + x) = 21
(d * 9 + x * 9) = 21
(9d + 9x) = 21

Solving
9d + 9x = 21

Solving for variable 'd'.

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

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

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

Divide each side by '9'.
d = 2.333333333 + -1x

Simplifying
d = 2.333333333 + -1x

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