Question 238112
Steps:
a.  simplify x value on te right side of eqn
b.  isolate the x values
c.  solve for x
.
Problem:
{{{8x-12=15x-4x}}}
{{{8x-12=11x}}}
{{{-12= 11x-8x}}}
{{{-12=3x}}}
Now divide 3 on both sides to determine value of x.
I'll let you finish it since it's only one more step and you're done!  :)