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=25a+b
2.15i+14b+13k+(-30i-45j+51k)=15i+14b+13k-30i-45j+51k
=-15i+14b-45j+64k
3.3-7x+35z+(4x+23y-9)=3-7x+35z+4x+23y-9
=-6-3x+35z+23y
4.42n + 35m +7 - (50m − 20n + 9) =42n+35m+7-50m+20n-9
=62n-15m-2
5.x − 1 −(5x + 3)=x-1-5x-3
=-4x-4
6.2y + 15z-(4y − 8) =2y+15z-4y+8
=-2y+15z+8
7.2z − 7-(5z + 3) =2z-7-5z-3
=-3z-10
8.x − y-(6x + 4)=x-y-6x-4
=-5x-y-4