rad(x+15)-rad(x-12)=3

Solution for rad(x+15)-rad(x-12)=3 equation:

Simplifying
rad(x + 15) + -1rad(x + -12) = 3

Reorder the terms:
adr(15 + x) + -1rad(x + -12) = 3
(15 * adr + x * adr) + -1rad(x + -12) = 3
(15adr + adrx) + -1rad(x + -12) = 3

Reorder the terms:
15adr + adrx + -1adr(-12 + x) = 3
15adr + adrx + (-12 * -1adr + x * -1adr) = 3
15adr + adrx + (12adr + -1adrx) = 3

Reorder the terms:
15adr + 12adr + adrx + -1adrx = 3

Combine like terms: 15adr + 12adr = 27adr
27adr + adrx + -1adrx = 3

Combine like terms: adrx + -1adrx = 0
27adr + 0 = 3
27adr = 3

Solving
27adr = 3

Solving for variable 'a'.

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

Divide each side by '27dr'.
a = 0.1111111111d-1r-1

Simplifying
a = 0.1111111111d-1r-1