100
If you work this out, the results are as follow (in bold):4x + 7 = -3xchanges to7 = -7xchanges to-1 = x is the anwser
No.
42
4 plus 3 equals 7
67 plus 3 equals 70.
3 plus 1 plus 4 equals 8
12
No! It equals 15, but 9-6=3.
2.5 plus 6 plus 3 equals 2.5 plus 6 plus 3
89