Question

resolva em reais as equações:
a) 3(2x+1) - (x-1) = - 1
b) 3(x-1)/2-1/3=0

Answer 1

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

Resposta a) :  x = -1

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3(x-1)/2-1/3=0
(3x -3) /2 -1/3 = 0
(3x -3) /2 = 1/3
3x -3 = 1/3  . 2
3x -3 = 2/3
3x = 2/3 + 3
3x = (2 + 9) / 3
3x = 11 / 3
x = 11/3  ÷ 3    " inverte "
x = 11/3 × 1/3
x = 11/9

Resposta b) : x= 11/9