Answer:
x=15
Step-by-step explanation:
we have,
9x-40=3x+20
=> 9x-3x=20+40
=>4x=60
=>x=60/4
= x=20
= 9x -40 =3x + 30
Find x
= 9x - 3x = 40+ 30
= 6x =70
x = 70/6
= 11.67
