120 + Х = 460
Х=460-120
Х=340
120+ 340= 460
460=460
Х + 89 = 689
Х=689-89
Х=600
600+ 89=689
689=689
540+Х=800
Х=800-540
Х=260
540+260=800
800=800
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120 + Х = 460
Х=460-120
Х=340
120+ 340= 460
460=460
Х + 89 = 689
Х=689-89
Х=600
600+ 89=689
689=689
540+Х=800
Х=800-540
Х=260
540+260=800
800=800