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R. Kanan= AX - A + BX^2 - B + CX^3 - CX + D
R. Kanan= CX^3 + Bx^2 + (A-C)X - (A+B-D)
Ruas kanan biar sama dg ruas kiri, maka
CX^3 = 3X^3, maka C = 3
Dst, prinsipnya sama.
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