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2 (x-y) + (×-y)
= 2x - 2y + x - y
= 3x - 3y
jawaban soal b
3(p-2q) + -5 (p+3q)
= 3p - 6q + -5p - 15q
= -2p - 21q
=2x+x-2y-y
=3x-3y
b) 3p-6pq+(-5p-15pq)
= 3p-6q-5p-15q
=-2p-21q