15.7. 1) 4b(7-8a) + a(8a-7) - (14-16a)+(7-8a)ab; 2) 3x(5y-4)-y(4-5y) + (15y-12)-3xy(4-5y);
3) mn(m-3n) - m(m-3n) - n(m-3n) +8(6n-2m);
4) (− ² t + k)x − (k − ² t)y + (3k − 2t)xy − (−2t + 3k).​
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