Please answer if you do your the best at life

a) x = -4

b) x = 13

c) x = -3

x+(-8)= -12

x-8= -12

x= -12+8

x=-4

-3 + x = 10

x=10+3

x=13

-2+x= -5

x=-5+2

x=-3

-8

step-by-step explanation:

answer: 0+0=0

step-by-step explanation:

that is the only answer that can make 0