Question

sendo x= -4 - (5-7); y= 2 + (9-15) e z = - 5 - (-2 -4), calcule o valor de x -y+z=

Answer 1

x=-4-(5-7)
x=-4+2
x=-2

y=2+(9-15)
y=2-6
y=-4

z=-5-(-2-4)
z=-5+6
z=1

x-y+z
-2-(-4)+1= 
2+1=3