2000-х=520*2
2000-х=1040
Х=2000-1040=960
2000-960=1040
2000-х=520:2
2000-х=260
Х=2000-260
2000-1740=260
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2000-х=520*2
2000-х=1040
Х=2000-1040=960
2000-960=1040
2000-х=520:2
2000-х=260
Х=2000-260
2000-1740=260