2. Раскройте скобки и приведите подобные:

a) 2(-7x - 3) - 7(-6x + 8) = -14x - 6 + 42x - 56 = 28x - 62

б) 2(-7x - 3) + 7(-6x + 8) = -14x - 6 - 42x + 56 = -56x + 50

в) 2(-7x - 3) - 7 + (-6x + 8) = -14x - 6 - 7 - 6x + 8 = -20x - 5

г) (-7x - 3) - (-6x + 8) = -7x - 3 + 6x - 8 = -x - 11

д) -(-7x - 3) + (-6x + 8) = 7x + 3 - 6x + 8 = x + 11