Answer
The equation is a contradiction.
Work Step by Step
Distribute through the parenthesis.
$-12x-6-3x+12=-15x+1$
Add/Subtract like terms.
$-15x+6=-15x+1$
Add $15x$ to each side. Because you are left with 2 unequal constants, no value of $x$ will satisfy the given conditions.
$6=1$