Question

Questão 6
Calcule o valor do termo desconhecido nas igualdades
a) 5x + 3 = 48
b) 7x- 3 = 39
c)12x + 15 = 75
d) 4x - 1 = 87​

Answer 1

a)

5x + 3 = 48

5x = 48 - 3

5x = 45

x = 45/5

x = 9

b)

7x - 3 = 39

7x = 39 + 3

7x = 42

x = 42/7

x = 6

c)

12x + 15 = 75

12x = 75 - 15

12x = 60

x = 60/12

x = 5

d)

4x - 1 = 87

4x = 87 + 1

4x = 88

x = 88/4

x = 22