1)x-35=-70
x = - 70 + 35
x = - 35
----------------------------
-35 - 35 = - 70
2)y+20=-67
y = - 67 - 20
y = - 87
----------------------------
-87 + 20 = - 67
3)-63+x=10
x = 10 + 63
x = 73
---------------------------------
- 63 + 73 = 10
4)28-a=-90
a = - 90 - 28
a = 118
--------------------------
28 - 118 = - 90
5)-75+x=30
x = 30 + 75
x = 105
--------------------------------
- 75 + 105 = 30