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(7x - 4)(7x + 4).
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-7x + 6 + 7x - 2 = 4
7x + y = 4y = 4 - 7x
7x + 16 = 3x + 4 4x = -12 x = -3
9x-4 = 7x+8 9x-7x = 8+4 2x = 12 x = 6
7x-4=9x+10-14=2xx=-7