Question

7-(3,1-0,1у-0,1)=-0,2

Answer 1

$7-(3,1-0,1y-0,1)=-0,2 \ 7-(3-0.1y)=-0.2 \ 7-3+0.1y=-0.2 \ 4+0.1y=-0.2 \ 0.1y =-0.2-4 \ 0.1y=-4.2 \ y=-4.2:0.1 \ y=-42$