Question

Me ajudem nessas equações :

a) 12=x-3

B) 21-6x=x

C) 3y=12

Answer 1

a)
$x = \frac{12}{3} \\ x = 4$
b)
$6 \times + x = 21 \\ 7x = 21 \\ x = \frac{21}{7}$
c)
$y = \frac{12}{3} \\ y = 4$

Answer 2

a) 12=x-3

12 + 3 =x

15 = x

B) 21-6x=x

- 6x - x = - 21

- 7x = - 21

x= - 21/-7

x= 3

C) 3y=12

y= 12/3

y= 4