None. 7x - 1 is not equal to 7x - 7.
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Let the number be x: 7x-6 = -20 7x = -20+6 7x = -14 x = -2
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It equals 53X- a number is squared when it is multiplied by itself, so 7X by 7X = 49X. 2X by 2X =4X, so 49X + 4X is 53X.
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Without an equality sign the given terms can't be considered to be a straight line equation.