Question

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 = ?

Answer 1

Problems: Answers:

12 x - 13 - x - 9 = 10x x = 22

-15k - 1 + 12 + 2k k = 11/13

10a - 7b + 11 + 8a - b - 12 b = (9 a)/4 - 1/8

7a^2 + 10a - 3a - 2a^2 a = -7/5

-c + 5d + 7c - 11d + d - 3c d = (3 c)/5

x^2 - 3xy - 5xy - 7y^2 + 4x^2 + 8y^2 y = 4 x - sqrt(11) x