Question

tìm X

[ ( 90 - 15 x X ) - 8 ] x 5 + 10 = 60 x 0,5

 

Answer 1

[(90-15xX)-8]x5+10=30

_____________=30-10

___________=20:5

_________=4+8

15xX=90-12

X=78:15

X=5.2

Answer 2

[(90-15x X)-8] x 5 + 10 = 60 x 0,5

[(90-15xX)-8] x 5 + 10 =  30

[(90-15xX)-8] x 5         =  30 - 10 = 20

(90-15xX)-8               =  20 : 5 = 4

90 - 15xX                   =  4 + 8 = 12

         15xX                 =  90-12

          15xX                 =  78

                X               =  78 : 15

                X                =   5,2