480'. Розв'яжіть рівняння усно: 1) 7 + x = 10; 3) x – 12 = 22; 2) y + 8 = 17; 4) 20 - y = 15; 5) 5. x = 15; 6) у. 12 = 12; 7) 16: x = 8; 8) у : 4 = 5.​
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