3d-5=7d-21

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Solution for 3d-5=7d-21 equation:


Simplifying
3d + -5 = 7d + -21

Reorder the terms:
-5 + 3d = 7d + -21

Reorder the terms:
-5 + 3d = -21 + 7d

Solving
-5 + 3d = -21 + 7d

Solving for variable 'd'.

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

Add '-7d' to each side of the equation.
-5 + 3d + -7d = -21 + 7d + -7d

Combine like terms: 3d + -7d = -4d
-5 + -4d = -21 + 7d + -7d

Combine like terms: 7d + -7d = 0
-5 + -4d = -21 + 0
-5 + -4d = -21

Add '5' to each side of the equation.
-5 + 5 + -4d = -21 + 5

Combine like terms: -5 + 5 = 0
0 + -4d = -21 + 5
-4d = -21 + 5

Combine like terms: -21 + 5 = -16
-4d = -16

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

Simplifying
d = 4

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