Question

50-Х=40 х+5=45 у-10=70

Answer 1

$50 - x = 40 \ x = 50 - 40 \ x = 10 \ \ x + 5 = 45 \ x = 45 - 5 \ x = 40 \ \ y - 10 = 70 \ y = 70 + 10 \ y = 80$

Answer 2

1)х=50-40
Х=10
2)х=45-5
Х=40
3)у=70+10
У=80