Question

Rezolvati ecuatiile, x € Z:


a) 2(2x+1)-4(x+3)=5-3(2x+1)

b) 3x+5-2(x+2)=8-3(1-x)

c) 19-4(3x-8)=3

d) 3(2x-7)-5(3x+1)+4x=8-2(5x-3)

Answer 1

a) 2(2x+1)-4(x+3)=5-3(2x+1)

4x+2-4x-12=5-6x-3

-10=2-6x

10=-2+6x

6x=10-(-2)    6x=10+2       6x=12    x=12/6   x=2

b)3x+5-2(x+2)=8-3(1-x)

3x+5-2x-4=8-3+3x

x+1=5+3x

5+3x-x-1=0

2x+4=0

2x=-4

x=-4/2  x=-2

c)19-4(3x-8)=3

19-12x+32=3

-12x+51=3

-12x=3-51  -12x=-48  12x=48   x=48/12   x=4

d)3(2x-7)-5(3x+1)+4x=8-2(5x-3)

6x-21-15x-5+4x=8-10x+6

-5x-26=-10x+14

-5x-26+10x-14=0

5x-40=0  5x=40   x=40/5    x=8             Sper ca te-am ajutat mult