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Solve the equation for x : 19(x + y) + 17 = 19(-x + y) - 21

Correct answer: A. -1

  • A. -1
  • B. -2
  • C. -3
  • D. -4
  • E. None of these

Explanation

Expand both sides: 19x + 19y + 17 = -19x + 19y - 21; the y terms cancel, giving 38x = -38 and x = -1. The likely trap is option b, -2, from mishandling the coefficient when moving the x terms together.

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