Question

Determine o número × que satisfaça cada igualdade.
×+(+10)=+16

×+(-2)=-10

×+(+20)=0

×+(-10)=+10

(+12)+×=+2

(-4)+×=+2

Answer 1

x+(+10)=+16
x+10=16
x=16-10
x=6
x+(-2)=-10
x-2= -10
x= -10+2
x= -8
x+(+20)=0
x+20=0
x= -20
x+(-10)=10
x-10= 10
x=10+10
x=20
+12+x=+2
x=2-12
x= -10
-4+x= 2
x=2+4
x=6