4d+7-d=21

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


Simplifying
4d + 7 + -1d = 21

Reorder the terms:
7 + 4d + -1d = 21

Combine like terms: 4d + -1d = 3d
7 + 3d = 21

Solving
7 + 3d = 21

Solving for variable 'd'.

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

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

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

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

Divide each side by '3'.
d = 4.666666667

Simplifying
d = 4.666666667

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