a) -(2y + 3x)-(-4y+2x-1)= -2y-3x+4y-2x+1 = 2y-5x+1
b) (6x-12y):3+x-4y = 2x-4y+x-4y = 3x-8y
c) (a^4-1)(a+1) = a^5+a^4-a-1
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a) -(2y + 3x)-(-4y+2x-1)= -2y-3x+4y-2x+1 = 2y-5x+1
b) (6x-12y):3+x-4y = 2x-4y+x-4y = 3x-8y
c) (a^4-1)(a+1) = a^5+a^4-a-1