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2. 3p pangkat 3+2q+5-p pangkat 2+2q-5 = 3p pangkat 3-p pangkat 2+4q
3. 2a+3ab+c+a-2ab+2c = 3a+ab+3c
4. 2x pangkat 4+10x pangkat 3+4x pangkat 2+50x-30