pre algebra

42=-2m-12+6

42+12-6=-2m

48=-2m

48/-2=m

-24=m

42=-2(m+6)+6

42=(-2m+-36)+6

42=(-2m=36)+6

42=m=18+6

42=m=24

42=24

ans= 2

42 = -2(m+6)+6

42 = -2m - 12 + 6

42 = -2m - 6

-2m = 48

m = -24

Same as Guest #2's answer.