Can you please find the value of y:

24y/5+42=5y+35

y=35

(24y+45*5)/5=5y+35

24y+210=5(5y+35)

24y+210=25y+175

210-175=25y-24y

35=y

in the 1st step why 5 was multiplied by 42. And if it is multiplied how can we multiply it again by 5y+35