3(d-7)=(d*2)-1

Solution for 3(d-7)=(d*2)-1 equation:

Simplifying
3(d + -7) = (d * 2) + -1

Reorder the terms:
3(-7 + d) = (d * 2) + -1
(-7 * 3 + d * 3) = (d * 2) + -1
(-21 + 3d) = (d * 2) + -1

Reorder the terms for easier multiplication:
-21 + 3d = (2d) + -1

Reorder the terms:
-21 + 3d = -1 + (2d)

Solving
-21 + 3d = -1 + (2d)

Solving for variable 'd'.

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

Add '(-2d)' to each side of the equation.
-21 + 3d + (-2d) = -1 + (2d) + (-2d)

Combine like terms: 3d + (-2d) = 1d
-21 + 1d = -1 + (2d) + (-2d)

Combine like terms: (2d) + (-2d) = 0
-21 + 1d = -1 + 0
-21 + 1d = -1

Add '21' to each side of the equation.
-21 + 21 + 1d = -1 + 21

Combine like terms: -21 + 21 = 0
0 + 1d = -1 + 21
1d = -1 + 21

Combine like terms: -1 + 21 = 20
1d = 20

Divide each side by '1'.
d = 20

Simplifying
d = 20