Question

Ma ajuta si pe mine cineva cu niste ecuatii?
2(x-1)+3(x+2)=5x+4

6-3(2-x)+4=7-x

-1,4(5-x)+2,5(2+x)=-3,6+x

5+7(1-x)-5x=x-8
 dar mai repede va rog frumos!!

Answer 1

2(x-1) + 3(x+2) = 5x + 4
2x - 2 + 3x + 6 = 5x + 4
2x + 3x - 5x = 4 + 2 - 6
x = 0

6 - 3(2 - x) + 4 = 7 - x
6 - 6 + 3x + 4 = 7 - x
3x + x = 7 - 6 + 6 - 4
4x = 3
x = 3/4

-1,4( 5 - x ) + 2,5( 2 + x ) = -3,6 + x
-7 + 1,4x + 5 + 2,5x = -3,6 + x
1,4x + 2,5x - x = -3,6 + 7 - 5
2,9x = -1,6
x = - 1,6 : 2,9
x = - 0,55

5 + 7( 1-x ) - 5x = x - 8
5 + 7 - 7x - 5x = x - 8
-12x - x = - 8 - 5 - 7
-13x = -20
x = (-20) : (-13)
x = 1,53 

Answer 2

2(x-1)+3(x+2)=5x+4
2x-2+3x+6=5x+4
5x+4=5x+4
5x-5x=4-4
0=0 
nu are solutii

6-3(2-x)+4=7-x
6-6+3x+4=7-x
3x+4=7-x
3x+x=7-4
4x=3
x=3/4

-1,4(5-x)+2,5(2+x)=-3,6+x
-7+1,4x+5+2,5x=-3,6+x
3,9x-2=-3,6+x
3,9x-x=2-3,6
2,9x=-1,6
x=-1,6/2,9=-16/10:29/10=-16/10·10/29=-16/29
x=-16/29

5+7(1-x)-5x=x-8
5+7-7-5x=x-8
5-5x=x-8
-5x-x=-8+5
-6x=-3                      ·(-1)
x=3/6=1/2
x=1/2