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=> (2m - 10) + (21 - 3n)
=> 2m - 3n - 10 + 21 = 2m - 3n + 11
b. 5(x - 2y + 1) dan -4(y - 3)
=> (5x - 10y + 5) + (-4y + 12)
=> 5x - 10y - 4y + 5 + 12
=> 5x - 14y + 17
c. 2p - 3q - 1 dan -p + q + 3
=> (2p - 3q - 1) + (-p + q + 3)
=> 2p - p - 3q + q - 1 + 3
=> p - 2q + 2
= 2m -4 - 3n
b. = 5x - 10y + 5 + -4y + 12
= 5x - 10y - 4y + 5 + 12
= 5x - 14y + 17
c 2p-3q-1+-p+q+3
=2p-p-3q+q-1+3
=p-2q+3