Question

a + 6 = 4
5 - 3 = -10
c - 1 = -15
d + 5 = 0
1 + x = 0
3 - x = -20
1 + x = -6
5 - x = 30

Answer 1

1) a+6=4
6-4=a
a=2

2)5-3=-10
5=-10+3
5=-13

3)c-1=-15
c=-15 +1
c= -16

4)d+5=0
d=0-5
d=5

5)1+x=0
x=0-1
x=1

6) 3-x= -20
x= -20-3
x= 23

7) 1+x= -6
x= -6-1
x= 5

5-x=30
x= 30-5
x = 25

Espero ter ajudado!! (^_-)