(580 в-25)*90+490 =850

Question

(580 в-25)*90+490 =850

Answer 1

(580 в-25)*90+490 =850

(580 в-25)*90=850-490

(580 в-25)*90=360

580в-25=360:90

580в-25=4

580в=4+25

580в=28=9

в=580:29

в=20