Question

respondam por favor ​

Answer 1

Olá, tudo bem? :-)

a) 7x - 1 = 20

7x = 20 + 1

7x = 21

x = 21/7

x = 3

b) 8 - 2x = 0

-2x = -8 .(-1)

2x = 8

x = 8/2

x = 4

c) 2x + 2x = 24

4x = 24

x = 24/4

x = 6

d) x² = 100

x = √100

x = 10

e) 50/x = 10

50 = 10x

50/10 = x

5 = x

x = 5