1) Найдите корень уравнения: а) 12х – 3x(6х– 9) = 9х(4– 2x)+3x,
б) 7х2 – x(7х – 5) – 2(2,5х + 1) – 3=0,
в) 8(х2 – 4) – 4х(3,5х – 7) = 20х – 6х2.

2) Упростите выражение и найдите его значение:
2m(m – n) – n(3m – n) – n(n+6),
если m = –4,n = 0,5
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