Answer:
x = 13
Step-by-step explanation:
y=50
50 = 5x - 15
50 + 15 = 5x
65 = 5x
65/5 = 5x/5
13 = x
x= - square root 141 or x= square root 141
82
2×m²+10
m²= -6×-6=36
36×2=72+10=82
Associative Property of Addition hope this helps