Question

помогите 170-x=80, a+90=160, 140-y=80

Answer 1

170-x=80
-x=80-170
-x=-90
x=90

a+90=160
a=160-90
a=70

1400-y=80
-y=80-140
-y=-60
y=60

Answer 2

x=170-80
x=90

a=160-90
a=70

y=140-80
y=60