Answer:
-7=12n-4
-12n-7=-4
-12n=-4+7
-12n=3
n=-1/4
5x+7=4
5x=4-7
5x=-3
x=-3/5
-28+15y=17
15y=17+28
15y=45
y=3
x/3+5=-2
x+15=-6
x=-6-15
x=-21
Step-by-step explanation:
