2(1-d)-(2d+1)=-7

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

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

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

Reorder the terms:
2 + -1 + -2d + -2d = -7

Combine like terms: 2 + -1 = 1
1 + -2d + -2d = -7

Combine like terms: -2d + -2d = -4d
1 + -4d = -7

Solving
1 + -4d = -7

Solving for variable 'd'.

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

Add '-1' to each side of the equation.
1 + -1 + -4d = -7 + -1

Combine like terms: 1 + -1 = 0
0 + -4d = -7 + -1
-4d = -7 + -1

Combine like terms: -7 + -1 = -8
-4d = -8

Divide each side by '-4'.
d = 2

Simplifying
d = 2