12.Раскройте скобки и приведите
подобные слагаемые:
а) 7× (2х - 3) + 4× (3х – 2);
-2 × (4k + 8) - 3 ×(5k - 1);
-8×(2 - 2y) + 4× (3 – 4у);
d) (3х - 11)×2-5×(4 - 3х);
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