September 2021 0 8 Report
2. Доведи тотожність, а) 7x - 5х + х - 4 + 4 = 1 + 3х - 1;
б) 9с – 9(1 + c – x) = 9x - 9;
в) 5(2x+y) = 10(х +y) – 5у.​
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