Step 1) Subtract #color(red)(6)# from each side of the inequality to isolate the #x# term while keeping the inequality balanced:
#3 - color(red)(6) >= 3x + 6 - color(red)(6)#
#-3 >= 3x + 0#
#-3 >= 3x#
Step 2) Divide each side of the inequality by #color(red)(3)# to solve for #x# while keeping the inequality balanced:
#-3/color(red)(3) >= (3x)/color(red)(3)#
#-1 >= (color(red)(cancel(color(black)(3)))x)/cancel(color(red)(3))#
#-1 >= x#
To solve in terms of #x# we must reverse or "flip" the inequality"
#x <= - 1#