#-2-6x=19#
Add #2# on each side of the equation to get rid of the #-2# on the left-hand side (whatever you do to one side of the equation, you must do to the other side)
#-2+2-6x=19+2#
#0-6x=19+2#
#-6x=21#
To solve for #x#, we must get #x# by itself. So, divide both sides of the equation by #-6#
#(-6x)/-6=21/-6#
#x=-21/6#
Simplify as much as possible, in this case, #3# is common in the denominator and numerator
#x=-7/2#