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(x-7) (x+1/2)
x*2 + 1/2x -7x - 7 1/2
[dikali 2 agar satu perdua hilang]
2 (x*2 + 1/2x -7x - 7 1/2)
2x*2 + x - 14x - 7
2x*2 - 13x - 7