15 * x - x = 378
= 15x - x = 378
= 14 * x = 378
x = 378 : 14
x = 27
15x -x=378
=>14x=378
=>x=378:14
=>x=27
k mk nha bn
15*x-x=378
=> 15x-x=378
=> 14x =378
=> x = 378:14
=> x = 27
Vậy x=27
15.x-x=378
14x-x=378
14.x=378
x=378:14
x=27
15 x - x = 378
=> 14 x = 378
x = 378 : 14
x = 27
15 × x - x = 378
=> 14 × x - x = 378
14 × x = 378
x = 378 ÷ 14
x = 27