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10 + 11 = 5x - 2x
21 = 3x
3x = 21
x = 21/3
x = 7
x - 5
7 - 5
= 2
2x - 5x = -11 - 10
-3x = -21
x = -21/-3
x = 7
x - 5
= 7 - 5
= 2