Question

The sum of triple a number and 6 is 9

Answer 1

We have an equation: 3*?+ 6= 9
⇒ 3*?= 9-6
⇒ 3*?= 3
⇒ ?= 3/3
⇒ ?= 1

The number is 1~

Answer 2

3x+6=9
Triple a number (3x) + 6
subtract 6 from both sides
3x=3
Divide by 3 on both sides
X=1