Question

Rezolvati in Z ecuatiile :
a)3[2(x-3)-5]-4(x-9)=x+5
b)-10-{-9-[-8-(-7-x)]-6}=5
c)12-{18-3[-6-2(3-4x)]: (-2)}=1-x
Va rog mult! Rezolvari complete...

Ps.:
{ - acolada
[-paranteza patrata

Answer 1

a)3[2(x-3)-5]-4(x-9)=x+5
3(2x-6-5)-4x+36=x+5
6x-33-4x+36=x+5
x+3=+5
x=2

b)-10-{-9-[-8-(-7-x)]-6}=5
-[-9-(-8+7+x)-6]=5+10
-9+1-x-6=-15
-15+1-x=-15
1-x=0
x=1

c)12-{18-3[-6-2(3-4x)]: (-2)}=1-x
12-[18-3(-6-6+8x): (-2)]=1-x
12-[18-3(-12+8x): (-2)]=1-x
12-[18-3(6-4x)]=1-x
12-[18-18+12x)]=1-x
12-12x=1-x
11x=11
x=1