If x = 3, then 7x - 21 is 0, If x=2, then x3 + 1 is 8, If x = -3 & y = 2, then 3x2 + 2y - 7 is -24, If a = 1 & b = 2, then a2 + 2ab + b2 is 9, if x = -1, then 6x - 3x + 1 is 2

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