3d+21=7-4a

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Solution for 3d+21=7-4a equation:


Simplifying
3d + 21 = 7 + -4a

Reorder the terms:
21 + 3d = 7 + -4a

Solving
21 + 3d = 7 + -4a

Solving for variable 'd'.

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

Add '-21' to each side of the equation.
21 + -21 + 3d = 7 + -21 + -4a

Combine like terms: 21 + -21 = 0
0 + 3d = 7 + -21 + -4a
3d = 7 + -21 + -4a

Combine like terms: 7 + -21 = -14
3d = -14 + -4a

Divide each side by '3'.
d = -4.666666667 + -1.333333333a

Simplifying
d = -4.666666667 + -1.333333333a

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