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= 4x - 8x + 5y + 23y
= -4x + 18y
7y + 21x itu kan variabelnya berbeda, jadi gak bisa dijumlahkan. kalau aku salah memahami soal, komentar ya, biar aku perbaiki
= 4x-8x+21x +5y+23y + 7y
= (4-8+21) x + (5+23-7) y
= 17x + 21 y