6x (3x – 7) = 7 (7 - 3x)
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6x (3x – 7) = 7 (7 - 3x)
=18x^2 - 42x =49 - 21x
=18x^2 - 49= - 21x+42x
=18x^2 - 49=21x
=18x^2 +21x - 49
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