Question

( 1/5 x ..............) -10 = 5 x 4

Answer 1

.... dimisalkan a ,,
(1/5 x a) -10 = 5 x 4
      1/5a -10 = 20
           1/5a = 30
               a = 150

Answer 2

Yang ditanya itu kita misalin b. jadi:
(1/5 x b) - 10 = 20
(1/5 x b) = 20 + 10
(1/5 x b) = 30
b= 30 x 5/1
b = 150