11. Rezolvaţi în Z ecuațiile:
a) 9(x - 2) = -63;
c)2(4x + 1) = 2(5x – 7);
e) 1-4. [-5. (x - 2)] = 21;
g) (x+3)(x - 7) = 0;
b) 5(x + 3) = 2(5x - 5);
d) 2(-x + 5) = -8(3x + 2) + 56;
f) 5(x - 2) - 7(x + 3) + 35 = 0;
h) (2x + 6)(x + 3) = 0.
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a) 9x -18 =-63
9x = -45
x = - 5
c) 8x +2= 10x-14
16 =2x
x =8
e) 1-4•[-5•(x-2)]= 21
-4•[-5•(x-2)]= 20
-5•(x-2)=-5
-5x +10 =-5
-5x = -15
x= 3
g)(x+3)(x-7)=0
x^2 -7x +3x -21=0
x^2-4x=21
b) 5x+15 =10x -10
25 =5x
x =5
d)-2x+10=-24x-16+56
22x = 30
x= 30 /22
x= 15/11
f)5x-10-7x-21+35=0
-2x+4=0
-2x= -4
x=2
h)(2x+6)(x+3)=0
2x^2+6x+6x+18=0
2x^2+12x+18=0