Answer: x = 25
Step-by-step explanation:
We know that they are the same on both side
5x + 15 = 6x - 10
+ 10 to both sides
5x + 25 = 6x
Subtract 5x from both sides
25 = x
Let's check it:
5(25) + 15 = 140
6(25) - 10 = 140
This is reasonable, since we know it has to be more than 90 but less than 180.
