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8 Find the sum of:a 3a+ b; 5a +2b; 3a-bс 5x2 + 7x + 3; 12x2-3x + 8: 6x2-4x + 9e 4x + 5y + 7; -5x-y-3; 3x-3y + 2d2а + 5b + 7; 8а-3b + 3.-5a-70-6 |
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