15=-0.2, y/-3=1/6, -2/3m=-12 and -4p+19=11 plzz me

-4p+19=11

Subtract 19 from both sides

-4p = -8

Divide each side by 4. It is a positive number.

I don't understand the first one but,
the second one
y / -3 = 1/6
multiply both sides by -3 to isolate the y
y = -1/2

the third one
-2/3 m = -12
we will multiply both sides by the reciprocal of 2/3 which is 3/2 
-m = -18
then we will divide both sides by -1 to isolate the variable
m = 18

the last one
-4p + 19 = 11
we will subtract 19 from both sides
-4p = -8
then divide by -4 to isolate the variable
p = 2

Hope this helps :)