Question

(|у|+7,9)-3,5=1,4 помогите решить​

Answer 1

$|y| - 7.9 - 3.5 = 1.4 \\ |y| - 11.4 = 1.4 \\ |y| = 11.4 - 1.4 \\ |y| = 12.8 \\ y = 12.8 \\ y = - 12.8$