Question

здраствуйте.помогите пжл.

Answer 1

30-х=20. х+1=40. у-8=7
х=30-20. х=40-1. у=8+7
х=10. х= 39.

30-10=20.
39+1=40.
15-8=7
у=15

Answer 2

30-х=20
x=30-20
x= 10

x+1=40
x=40-1
x=39

y-8=7
y=8+7
y=15