Question

x*7/20+x*3/5+x*21/100+4160=x

Answer 1

7х/20 + 3х/5 + 21х/100 + 4160 = х

35х/100 + 60х/100 + 21х/100  + 4160 = х

116х/100 + 4160 = х

116х/100 - х = -4160

116х/100 - 100х/100 = -4160

16х/100 = -4160

16х=-416000

х=-26000