3[d-5]=-21

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Solution for 3[d-5]=-21 equation:


Simplifying
3[d + -5] = -21

Reorder the terms:
3[-5 + d] = -21
[-5 * 3 + d * 3] = -21
[-15 + 3d] = -21

Solving
-15 + 3d = -21

Solving for variable 'd'.

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

Add '15' to each side of the equation.
-15 + 15 + 3d = -21 + 15

Combine like terms: -15 + 15 = 0
0 + 3d = -21 + 15
3d = -21 + 15

Combine like terms: -21 + 15 = -6
3d = -6

Divide each side by '3'.
d = -2

Simplifying
d = -2

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