Question

resolva as equacoes em

A)2x-0,5=4x+5,5

B)-2(x-2=3(x-1)

C)3/4(x-2)=x/6-1

D)x+2=12x-2/6-18-4x/3

Answer 1

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

B)-2(x-2=3(x-1) ==> -2x +4 = 3x - 3 ==> 3x+2x = 4 +7 ==> 5x = 7 ==>x = 7/5

C)3/4(x-2)=x/6-1 ==> 3x- 6 =  x  - 1   mmc=12
                                   4       6
9x - 18 = 2x - 12 ==> 9x-2x = - 12 +18 ==>7x = 6 ==> x = 6/7

D)x+2=12x-2/6-18-4x/3

   x + 2 = 12x - 2 - 18 - 4x  mmc =6
                  6            3
    6(x+2) = 12x - 2 - 2(18-4x)
     6x +12 =12x - 2 -36 + 8x
     12+2+36 = 12x+8x -6x
          50 = 14x
           x = 50/14  ou x =25/7