Question

descubra o valor de x:
5+x=4
x-8=4
12+x=30
x-18=0
4=x+12
3=x-5
3-x=2
5-x=8
20+x=20
x-18=18-x

Answer 1

x=4-5
x=-1

x=8+4
x=12

x=30-12
x=18

x=18

x=4-12
x=-8

x=3+5
x=8

x=20-20
x=0

x+x=18+18
2x=36
x=18

Espero ter ajudado ^.^