Уравнения
1)(24+x)-21=10
2)(45-y)+18=58
3)(y-35)+12=32
4) 56-(x+12)=24

1)(24+x)-21=10
24+x=10+21
24+x=31
x=31-24
x=7
2) (45-y)+18=58
45-y=58-18
45-y=40
y=45-40
y=5
3)(y-35)+12=32
y-35=32-12
y-35=20
y=35+20
y=55
4)56-(x+12)=24
x+12=24+56
x+12=80
x=80-12
x=68