Question

simplifique e resolva as equações a) 9+4x-8=21

Answer 1

9+4x-8=21
4x=21-9+8
4x=20
x=20/4
x=5

Answer 2

9+4x-8= 21

4x+1= 21

4x= 21-1

4x= 20

 x= 20/4

 x= 5

Resposta → S= {5}