Question

resolva as equações

Answer 1

a) - 40 = -10x
      4 = x 
b) 3x = - 45 - 2x
    5x = -45
     x = -9
c) 6(x +3) - 2(x-5) = 20
    6x +18 -2x +10 = 20 
    4x + 28 = 20
     4x = -8
       x = -2
d) -18 = 2x+ 15
    -2x = 33
      x = - 16, 5
e)2(x - 1) - 1 = 8
    2x - 2 - 1 = 8 
    2x -3 = 8
    2x = 11
      x =5,5
f) 2(x - 7) - 4(5 - x) = 2
    2x - 14 -20 +4x = 2
    6x - 34 = 2
    6x = 36
      x = 6