Party-parties; man-men; box-boxes; ball-balls; boy-boys; knife-knives; watch-watches
2/5=4/10,40/100,400/1000 = 0,4
5/8=625/1000 = 0,625
7/20=35/100 = 0,35
19/50=38/100 = 0,38
2/125=16/1000 = 0,016
Х+48=75
х=75-48
х=27
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у-74=20
у=74+20
у=94
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85-х=18
х=85-18
х=67
1+23+4+5+67=100
2+34+56+7=99