Mathematics, 05.09.2021 20:40, theojw

12 x - 13 - x - 9 = 10x = ? -15k - 1 + 12 + 2k = ?
10a - 7b + 11 + 8a - b - 12 = ?
7a^2 + 10a - 3a - 2a^2 = ?
-c + 5d + 7c - 11d + d - 3c = ?
x^2 - 3xy - 5xy - 7y^2 + 4x^2 + 8y^2 = ?

Answers: 2

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12 x - 13 - x - 9 = 10x = ? -15k - 1 + 12 + 2k = ?
10a - 7b + 11 + 8a - b - 12 = ?
7...