Mari kita sekolah ;-;x=5x+x-x÷x=….​

f(5) = 5 + 5 – 5 : 5

f(5) = 5 + 5 – 1

f(5) = 10 – 1

f(5) = 9

x + x – x ÷ x

5 + 5 – 5 ÷ 5

5 + 5 – ( 5÷5 )

5 + 5 – 1

10 – 1

9