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b). 5x+3-(x-1) =4x+4
=3-17x+35z+4x+23y-9
=3-9-17x+4x+35z+23y
=(-6)-13x+35z+23y
B. (5x+3)-(x-1)
= 5x+3-x+1
= 5x-x+3+1
= 4x+4