709-(х+120)=400
709-х-120=400
589-х=400
-х=400-589
-х=-189
х=189
__________________
45:х=(584-579)
45:х=5
5х=45
х=45:5
х=9
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709-(х+120)=400
709-х-120=400
589-х=400
-х=400-589
-х=-189
х=189
__________________
45:х=(584-579)
45:х=5
5х=45
х=45:5
х=9