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(10p - 8) - (8p - 10) = 10p - 8p - 8 + 10 = 2p + 2
soal b
(2 - 10m + 15mn) - (m(3n+5)) = 2 - 10m + 15mn - 3mn - 5m = 2 - 15m + 12mn
soal c
8y(5x - 9z) - (5x(8y - 9z)) = 40xy - 72yz - 40xy + 45xz = 45xz - 72yz