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1(x+6) + 4(x+3)
x² + 6x + 3x + 18
= x+6 + 4x+12
x² + 9x + 18
= 5x+18
x² + 9x + 18
kedua, atas dikurang bawah sesuai variabel nya.
⇒ -x² + 14x
maaf kalo salah :)