Answer:
In this case, x=-5.333333333 *Remember that this is a negative*
Explanation:
5x-12=8x+4 add 12 to both sides (LHS and RHS)
5x=8x+16 now subtract 8x from both sides to get all x values on 1 side
-3x=16 divide both sides by -3 to get it down to just x=number
x=-5.333333333333333333 (its a repeating decimal)