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13a+21a-8b+9b
34a+1b
b.(15i - 14j + 13k) + (-30i - 45 j + 51k)=
15i-30i-14j-45j+13k+51k
-15i-59j+64k
c.(3x - 17 y +35z) + (4x + 23y - 9z )=
3x+4x-17y+23y+35z-9z
7x+6y+26z
semoga membntu ya
jgn lupa follow akun saya:)