Question

x + x + x = 21
y + y + y = 30
z + z - z = 15
x + y × z = ?​

Answer 1

Step-by-step explanation:

x+x+x=21

3x=21

x=7

y+y+y=30

3y=30

y=10

z+z-z=15

z=15

x+y*z=7+10*15

157