Question

11. Rezolvaţi în Z ecuațiile:
a) 9(x - 2) = -63;
c) 2(4x + 1) = 2(5x - 7);
e) 1-4.1-5. (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.​

Answer 1

a) 9(x-2)=-63

9x-18=-567

9x=-567+18

9x=-549

x=-61

c)2(4x+1)=2(5x-7)

8x+2=10x-14

8x-10x=-2-14

-2x=-16

x=8