Solve please c)3(3z +1) less than or equal to -2(9 - z)?

c)
3(3z + 1) ≦ -2(9 - z)
9z + 3 ≦ -18 + 2z
9z - 2z ≦ -18 - 3
7z ≦ -21
z ≦ -21/7
z ≦ -3

d)
3(y - 1) + 10 ≧ -5(2 - y) - 7
3y - 3 + 10 ≧ -10 + 5y - 7
3y + 7 ≧ -17 + 5y
3y - 5y ≧ -17 - 7
-2y ≧ -24
y ≧ -24/-2
y ≧ 12

Part c)
9z + 3 ≤ - 18 + 2z
7z ≤ - 21
z ≤ - 3

Part d)
3y - 3 + 10 ≥ - 10 + 5y - 7
7 ≥ - 17 + 2y
24 ≥ 2y
y ≤ 12

c) z = less than -3
d) y = less than 12