Question

find a number if 20 less number than the number equals three times the sum of twice the number and 20

Answer 1

let the no be x
x-20=3(2x+20)
⇒x-20=6x+60
⇒-5x=80
⇒x=-16

Answer 2

let no. be x
x-20=3(2x+20)
⇒x-20=6x+60
x-6x=60+20
⇒-5x=80
x=80/-5
⇒x=-16