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b) -a+(2a-3b-1) = -a+2a-3b-1 = a-3b-1
c) -x do 2 +(x² - x - 7) = -x do 2+x²-x-7 = 1 do 2+x²-7
d) -b³ - (b³ - b² - b) =-b³ -b³+b²+b = -2b³ +b²+b
e) (2a - 3b) + (4a-b) = 2a - 3b +4a-b = 6a-4b
f) -(x² - 3x)+(x²+3x) = -x² + 3x +x²+3x = 6x
g) (a+b - c)-(2a-b+2c) = a+b-c-2a+b-2c=2b - a - 3c
h) -(x² -xy-z)-(-x² +2xy + 2z) = -x² +xy+z +x² -2xy - 2z = -xy-2z