d=((v-3)+(v+3))(7.5)

Solution for d=((v-3)+(v+3))(7.5) equation:

Simplifying
d = ((v + -3) + (v + 3))(7.5)

Reorder the terms:
d = ((-3 + v) + (v + 3))(7.5)

Remove parenthesis around (-3 + v)
d = (-3 + v + (v + 3))(7.5)

Reorder the terms:
d = (-3 + v + (3 + v))(7.5)

Remove parenthesis around (3 + v)
d = (-3 + v + 3 + v)(7.5)

Reorder the terms:
d = (-3 + 3 + v + v)(7.5)

Combine like terms: -3 + 3 = 0
d = (0 + v + v)(7.5)
d = (v + v)(7.5)

Combine like terms: v + v = 2v
d = (2v)(7.5)

Remove parenthesis around (2v)
d = 2v(7.5)

Reorder the terms for easier multiplication:
d = 2 * 7.5v

Multiply 2 * 7.5
d = 15v

Solving
d = 15v

Solving for variable 'd'.

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

Simplifying
d = 15v