Уравнения

1) (45-у) + 18=58

2) (у-35) + 12=32

3) 56 - (х+12) = 24

4) 55 - (х - 15) = 30

1) (45-y) + 18=58

45-y=58-18

45-y=40

-y=40-45

y=5

2) (y-35) + 12=32

y-35=32-12

y-35=20

y=20+35

y=55

3) 56 - (x+12) = 24

-x-12=24-56

-x-12=-80

-x=-80+12

-x=-67

x=67

4)

55 - (x-15) = 30

- (x-15) = 30-55

x-15=25

x=25+15

x=40