Question

Помогите пожалуйста!
y+7×(y-3,1)=
1,1x+1,3×(2x-4)=
x+4,5x+9×(x+5,2)=
7,1×(x+0,2)+1,8=

Answer 1

=у+7у-21,7=8у-21,7
=1,1х+2,6х-5,2=3,7х-5,2
=х+4,5х+9х+46,8=14,5х+46,8
=7,1х+1,42+1,8=7,1х+3,22