#-8m+12=-2m+27#
#"Subtracting 12 from both sides."#
#-8m+cancel12-cancel12=-2m+27-12#
#-8m=-2m+15#
#"Adding"# #2m# #"to both the sides"#
#-8m+2m=-cancel(2m)+cancel(2m)+15#
#-6m=15#
#"Dividing both sides by -6"#
#(cancel-cancel6m)/(cancel-cancel6)=15/-6#
#color(red)(m=-15/6 or m=-2 3/6#
#-"Hope this helps! :)"#