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3. Reduceți termenii asemenea: 2 9 2 4 -x-2,7y + 5y-3,25; b)-x-x-4,5y +9y-8,45; 15 15 8 5 c) x-x-6,8y + 8y-5,54; 15 12 7 5 e) x-x-5,6y + 6y - 7,4; 15 18 5 8 5 4 d) x-x-7,3y + 1ly-9,12; 15 6 f) 7 11 -x-x-8,2y + 13y - 2,17. 8 18 urgent​