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=25a+b
2. ( 15i + 14b + 13k) + ( -30i - 45J + 51k) =15i-30i+14b-45j+13k+51k=-15i+14b-45j+64k
3.( 3 - 17x + 35z) + ( 4x + 23y - 9) =-6-13x+23y+35z
4.-15m+62n-2
5.4y+4