Question

9x-(5-x ) b) 7x+(2-10x)-(x-4) c) 2x-1,5x+2+(-2x+2,3x-6 d)x-2y+2x+2z-y-y+x-3z pé me ajude me

Answer 1

a) 9x-(5-x ) =
    9x -5 +x =
    10x = 5
        x = 5/10
        x = 1/2


b) 7x+(2-10x)-(x-4) =
    7x +2 -10x -x +4 =
    7x -10x -x +2 +4 =
    -4x +6 =
    -4x = -6
       x = -6/-4
       x = +3/2


c) 2x-1,5x+2+(-2x+2,3x-6) =
    2x - 1,5x +2 -2x +2,3x -6 =
    2x -1,5x -2x +2,3x = -2 +6
    4,3x - 3,5x = 4
    0,8x = 4
         x = 4/0,8
         x = 5


d) x -2y +2x +2z -y -y +x -3z =
    x +2x +x -2y -y -y +2x -3z = 
    4x -4y -z