Question

Resolva as equações :

b) (3x+1)(x-1)-3(x+2)² = -9
Resp : -2/7

c) x-2/4 + 2x+8/5 = 5
Resp : 6

d) x+1/x-1 + 2x-5/x-3 =3
Resp : 7/3

Answer 1

c) multiplica cruzado q vai dar 
4x-2+10x+8=5
4x-10x=5+2-8
-6x= -1
x= -6/-1 => 6

só sei essa :/