3-(4d+9)=21

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Solution for 3-(4d+9)=21 equation:


Simplifying
3 + -1(4d + 9) = 21

Reorder the terms:
3 + -1(9 + 4d) = 21
3 + (9 * -1 + 4d * -1) = 21
3 + (-9 + -4d) = 21

Combine like terms: 3 + -9 = -6
-6 + -4d = 21

Solving
-6 + -4d = 21

Solving for variable 'd'.

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

Add '6' to each side of the equation.
-6 + 6 + -4d = 21 + 6

Combine like terms: -6 + 6 = 0
0 + -4d = 21 + 6
-4d = 21 + 6

Combine like terms: 21 + 6 = 27
-4d = 27

Divide each side by '-4'.
d = -6.75

Simplifying
d = -6.75

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