Question

Sa se rezolve in Z barat (ecuatiile):
a) -3(x+1)=2(x+1)-75
b) 5(x-2)- 7(x+4)=0
c) 2(x-3) -5 ( 3x+4) = -8x + 4

Answer 1

a) -3x-3=2x+2-75
    -3x-3=2x-73
    -5x=-70
    => 5x=70 => x=14
b) 5x-10-7x-28=0
    2x=38
    x=19
c)2x-6-15x-20=-8x+4
   -13x-26=-8x+4
   -5x=30

Answer 2

a) - 3(x + 1) = 2(x + 1) - 75
    - 3x - 3 = 2x + 2 - 75
    - 3x - 2x = 3 - 73
      - 5x = - 70
      x = 70 : 5 
      x = 14
b) 5(x - 2) - 7(x + 4) = 0
    5x - 10 - 7x - 28 = 0
    - 2x = 38
    x = - 38/2
    x = -19
c) 2(x - 3) - 5(3x + 4) = - 8x + 4
    2x - 6 - 15x - 20 = - 8x + 4
    - 13x + 8x = 26 + 4
    - 5x = 30
    x = - 30/5
    x = - 6