Rút gọn

Bài 1 Bính (rút gọn a) x (x-5) + (2x-2) (x+1)
b) x (x-5) - (x-7) (x+2)
C) 4x (x²-x+3) - (x-6) (x-5)
d) (x+5) (x-7) - (2x-5) (x+3)
Bai 2: Tìm x biết : 
a) 4x (X-5) - (x-1) (2x-3) = 5
b) (3x-4) (x-2) = 3x (x-9)-3
c) - (x+3)(x-2) + (x-1) (x+1)=0
d)(2x-1)(x-2) - (x+3) (2x-7)=3