Question

tell me fast!
others answer will report​

Answer 1

Answer:

$let \: the \: number \: be \: x \\ 6 \times x + 12 = 84 \\ 6x + 12 = 84 \\ 6x = 84 - 12 \\ 6x = 72 \\ x = 12$

Answer 2

Answer:

let the number is x

so

x*6+12=84

6x+12=84

6x=84-12

6x =72

x=72/6

x=12