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b) -3*(2x-y+5)= -6x + 3y - 15
c) (-2x+y)+(3x-4y)= -2x + y + 3x - 4y = x - 3y
d) (m-2)-(4m+5n-7)= m - 2 - 4m - 5n + 7 = 5 - 3m - 5n
e) 4(-2x-y+5)= - 8x - 4y + 10
f) -2(x-y)-3(x+1)-(y-4) = -2x + 2y - 3x - 3 - y + 4 = -5x + y + 1
b =2*2x-y
c =x-3y
d =-3m-5-5n
e =9-2x-y
f =-1+2x+2y