Question

Tìm x 5x+10-2x+50-x=90

Answer 1

5x + 10 - 2x + 50 - x = 90

5x - 2x - x = 90 - 10 - 50

x ( 5 - 2 - 1 ) = 30

x . 2 = 30

x = 30 : 2

x = 15

Vậy x = 15

=))

Answer 2

5x + 10 - 2x + 50 - x = 90

( 5x - 2x - x ) + ( 10 + 50 ) = 90

2x + 60 = 90

2x = 30 => x = 15