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=-3a-b-5-2a+5b+7
=-3a-2a-b+5b-5+7
=-5a+4b+2
B.2(a-3b)+5(a+2b)
=2a-6b+5a+10b
=2a+5a-6b+10b
=7a+4b
C. (x-5) pangkat 2
= x pangkat 2 - 10x +25