help on math problems??

-6=y/5 +4 transfer 4 to the other side
-6-4=y/5
-10=y/5 multiply both side by 5 to cancel the denominator
y=-50

7/9=2n+1/9
7/9-1/9=2n
6/9=2n
n=6/18

-4/5t+2/5=2/3
-4/5t=2/3-2/5
-4/5t=4/15
t=-3

-(x-10)=7
-x+10=7
-x=7-10
-x=-3
x=3

-6 =y/5 +4
(-6) - 4 = y/5
-10 = y / 5
(-10) / 5 = y
(-2)= (the answer)

7/9 = 2n + 1/9
7/9 - 1/9 = 2n
6/9 = 2n
2/3 = 2n
(2/3) / 2 = n
2/3 x 1/2 = n
1/3 = (the answer)

thats all i can help you. sorry.

-10=y/5
-50=y
6/9=2n 2/3=2n
n=1/3
-12/15t+6/15=10/15 -12t+6=10 -12t=4 t=-4/12
t=-1/3
10-x=7 -x=-3
x=3

y = -50
n = 1/3
t = -3
x= 3