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x - 11 = 20 → x = 20 + 11 → x = 31
x - 7 = 13 → x = 13 + 7 → x = 20
x - 9 = 1 → x = 1 + 9 → x = 10
x + 15 = 30 → x = 30 - 15 → x = 15
x - 20 = 10 → x = 10 + 20 → x = 30
x - 11 = 2 → x = 2 + 11 → x = 13
Espero haberte ayudado, saludos!