請問有無人可以幫我解答以下的方程式 急急急急急急

(1.)
7(d - 3) - 2d = 9
7d - 21 - 2d = 9
5d - 21 = 9
5d = 30
d = 6


(2.)
10k - 3(2 - 5k) = 44
10k - 6 + 15k = 44
25k - 6 = 44
25k = 50
k = 2


( 3.)
4(v - 8) + 3(v + 7) = 24
4v - 32 + 3v + 21 = 24
7v - 11 = 24
7v = 35
v = 5


(4.)
3(r + 2) + 2(r - 4) = 18
3r + 6 + 2r - 8 = 18
5r - 2 = 18
5r = 20
r = 4


(5.)
5(u - 3) - 2(u + 5) = 11
5u - 15 - 2u - 10 = 11
3u - 25 = 11
3u = 36
u = 12

1）7d-21-2d=9
..........7d-2d=9+21
................d=30

2）10K-6-15K=44
........10K-15K=44+6
...............25K=50
...................K=2

3) 4v-32+3v+21=24
................4v+3v=24+32-21
......................7v=35
........................v=5

4) 3r+6+2r-8=18
............3r+2r=18-6+8
.................5r=20
...................r=4

5) 5u-15-2u-10=11
..............5u-2u=11+15+10
...................3u=36
.....................u=12