Answer:
4
Step-by-step explanation:
3= a -1
+1 = a. you pass the negative 1 to the other side.
and it turns to a + 1 and then you add it which
gives you 4
4= a
Rewritten: 15m -3 - 5m
15m − ( 3 + 5m )
15m -3 - 5m
10m - 3
x = 4
