=(4-x^2)/(4-x)(4+x)-(x+1)/(x+4)=((4-x^2)-(x+1)(4-x))/(4-x)(4+x)=(4-x^2-4x+x^2-4+x)/(4-x)(4+x)=-3x/(16-x^2)
a) 18x-3x + 5x = 20 x
б) 2y - 9y = -7y
в) 1.2c - 0.3 c + 5 = 0.9c +5
г) 2a - 15 - a + 6 = a -9
д) t+ 6.3t - 2.1t =5.2t
е) 5x - 5 + 3x -4x = 4x -5
ж) -a-a-a-a = -4a
з) -2n-2n-2n = - 6n
и) 1/3x + 1/3x + 1/3x= x
<span>Задание решено!!!Ответ во вложении!!</span>