Which one is incorrect?

general knowledge math & puzzles

  1. 3x(7x+12)=94 then x=2

  2. 10x+49-99=0 when x=5

  3. 5x(17x+13x)=600 when x=2

  4. 2x-7x = -125 when x=25

Show answer
Correct Option: A

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