4x - 7 = 5 + 7x
x = -4
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3x + 4x = 847x = 84divide both sides by 7x = 12
7x2 -4x -5x2 +2x = 2x2 -2x
11x - 21 = 7x + 3 4x = 24x = 6
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.
4x