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catatan : 2x dibagi 2x jadi dicoret keduanya, -40 - 5 = -45
(2x.2x) + (7x.7x) - (14x) - 45 =
(4x) + (49x) - (14x) - 45 =
(39x) - 45
jadi hasilnya 39x-45
semoga benar..