1. 7d-13=3d+7
2. 7d-20=3d
3. -20=-4d
4. d=5
5. Check your answer:
7*5-13=22, 3*5+7=22
D equals 5
3d + 8 = 2d - 7 3d -2d = -8 - 7 1d = - 15 d = -15
c = 6 and d = 7
3d+8=2d-7 3d+8-8=2d-7-8 (substract 8 on both side) 3d=2d-15 3d-2d=2d-2d-15 (substract 2d on both side) d=-15
It equals 24.
96
It doesn't ! -7 plus -5 equals -12 ! -7 plus 5 equals -2
89
If I am correct, 9 plus 7 equals 112.
35
28
144
Yes.