Respostas

  • Usuário do Brainly
2014-04-28T16:33:56-03:00
7x - [5x + 3 - (2x + 1) - 10] = - (- x + 3)
7x - [5x + 3 - 2x - 1 - 10] = x - 3
7x - [5x - 2x + 3 - 1 - 10] = x - 3
7x - [3x - 8] = x - 3
7x - 3x + 8 = x - 3
7x - 3x - x = - 3 - 8
3x = - 11
x = - 11/3
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