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maaf kalo salah
1) (13a-8b)+(12a+9b) = (13a+12a) + (-8b+9b) = 25a + b
2) (15i+14j+13k)+(-30i-45j+51k) = (15-30)i + (14-45)j+(13+51)k = -15i-30j+64k
(ane anggap salah cetak dalam soal, 14b diganti 14j)
3) (3-17x+35z) + (4x+23y-9) = (-17+4)x + 23y + 35z + 3 - 9 = -13x+23y+35z- 6
4) (42n + 35m +7) - (50m - 20n + 9) = (35-50)m + (42+20)n + 7 - 9 = -15m+62n-2
5) (5x+3)-(x-1) = (5-1)x + 3 + 1 = 4x + 4