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bel72777

Ответ:

Пошаговое объяснение:

42y+98y-180=240

2(21y+49y-90)=240

21y+49y-90=240/2

7(3y+7y)=120+90

10y=210/7

y=30/10=3

47y + 53y =1800

100y=1800 |100

y=18

46d – 24d + d - 23=23

23d-23=23 |23

d-1=1

d=1+1=2

78x + 92x = 340

170x=340 |170

x=2

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