Question

18+(16-х)*8=90помогите и второе (4900:у-280):60=7

Answer 1

1) 18+(16-х)*8=90

18+128-8x=90

146-8x=90

-8x=90-146

-8x=-56

x=7

2) (4900:у-280):60=7

(4900/y-280)*1/60=7

4900-280y/60y=7

4900-280y/60y=7, y$\neq$ 0

20(245-14y)/60y=7

245-14y/3y=7

245-14y=21y

-14-21y=-245

-35y=-245

y=7, y$\neq$0

y=7