(30-15)+у =80 , а+(45-30)=75 , ×+12=50-(15+5)

Question

(30-15)+у =80 , а+(45-30)=75 ,

×+12=50-(15+5)

Answer 1

(30-15)+у=80
15+у=80
у=80-15
у=65

а+(45-30)=75
а+5=75
а=75-5
а=70

х+12=50-(15+5)
х+12=50-20
х+12=30
х=30-12
х=18

Answer 2

1) 15+у=80
у=65
2)а+15=75
а=50
3)х+12=30
х=18