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=15a+2a-20b+2b
=17a-18b
2.6a+12ab+5ab
=6a+17ab
3.6a-42b-3a-6b
=6a-3a-42b-6b
=3a-48b
4.maaf soalnya ga jelas
5.10a-15b+10a-6b
=-21b