Question

a) 3x +4x = 21
b) 2x = 15 + 5
c) 2x + 7x = 27
d) 8x + 4x = 20 + 4​

Answer 1

Resposta:

a) x = 3

b) x = 10

c) x = 3

d) x = 2

Explicação passo-a-passo:

a) 3x + 4x = 21

7x = 21

x = $\frac{21}{7}$

x = 3

b) 2x = 15 + 5

2x = 20

x = $\frac{20}{2}$

x = 10

c) 2x + 7x = 27

9x = 27

x = $\frac{27}{9\\}$

x = 3

d) 8x + 4x = 20 + 4

12x = 24

x = $\frac{24}{12}$

x = 2