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b. x+2y-z + (2x-y+3z)= 3x +y +2z
c. 4 - 2a + 6b + 5a + 3b -2 = 2+3a+9b
b) x+2y-z+2x-y+3z = x+2x+2y-y-z+3z = 3x+y+2z
c) 4-2.(a+3b)+5a+3b-2
= 4-2a-6b+5a+3b-2
= -2a+5a-6b+3b+4-2
= 3a-3b+2