Mathematics, 24.02.2021 14:00, Ab20600

Which of these is a correct identity?
x + 4x = 5x
6x = 18
2x + 1 = 7
7x + 9 = x

Answers: 1

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Do you know the correct answer?

Which of these is a correct identity?
x + 4x = 5x
6x = 18
2x + 1 = 7
7x + 9...