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=8a+16b - 24a+12 b
=8a-24a+16b+12b
=-16a+28b
2.=4-2(a+3b)+5a+3b-2
=2a+6b+5a+3b-2
=2a+5a+6b+3b-2
=7a+9b-2
maaf kalo ada yang salah.
I Wayan Cahya Mahastya.