X:5=890
1768:x=8
86-(14+x)=21
37-(4+x)=9
(1545+x):83=70
(90-x)+60=150
1768:x=8
86-(14+x)=21
37-(4+x)=9
(1545+x):83=70
(90-x)+60=150
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Answers & Comments
х=890*5.
х=4.450.
1768:х=8.
х=1768:8.
х=221.
(1545+х):83=70
1545+х*83=70
1545+83х=70
1545-70=-83х
х=1475:(-83)
х=-17,7
(90-х)+60=150
90-х+60=150
150-х=150
х=150:150
х=1
86-(14+х)=21
86-14-х=21
72-21=х
х=51
37-(4+х)=9
37-4-х=9
33-9=х
х=24