x^2 + 4x - 5 - { x^2 - 5x + 6 } = 88
x^2 + 4x - 5 - x^2 + 5x - 6 = 88
9x - 11 = 88
9x = 99
x = 11
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x^2 + 4x - 5 - { x^2 - 5x + 6 } = 88
x^2 + 4x - 5 - x^2 + 5x - 6 = 88
9x - 11 = 88
9x = 99
x = 11