0.5m+6.4=4.9-0.1m
0.5m+ 6.4= 4.9- 0.1m add .1m to both sides subtract 6 from both sides
.6m = - 1.5 divide both sides by .6
m = -1.5 / .6 = -5/2 = -2.5 = - (2 + 1/2)
Your answer is:
m= -2 1/2