-7(5+9d)=21

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Solution for -7(5+9d)=21 equation: 


Simplifying
-7(5 + 9d) = 21
(5 * -7 + 9d * -7) = 21
(-35 + -63d) = 21

Solving
-35 + -63d = 21

Solving for variable 'd'.

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

Add '35' to each side of the equation.
-35 + 35 + -63d = 21 + 35

Combine like terms: -35 + 35 = 0
0 + -63d = 21 + 35
-63d = 21 + 35

Combine like terms: 21 + 35 = 56
-63d = 56

Divide each side by '-63'.
d = -0.8888888889

Simplifying
d = -0.8888888889

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