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b)5a-(a+1)=5a-a-1=4a-1
c)2x-(3-5-x)=2x-(-2-x)=2x+2+x=3x+2
d)2a + ( 3a - 2b ) + ( a + b )=2a+3a-2b+a+b=6a-b
e) 5a - ( 2-x ) + b - 2x + 5 =5a-2+x+b-2x+5=5a+b-x+3
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