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b)a-3b-a-2b=-5b
c)x+3-2x-3=-x
d)2x-14+3x-3=5x-17
b) (3a-9b) : 3-(2a-4b) :2= a-3b-a-2b=(-5b)
c)(2x+6):2-(6x-9):3=x+3-2x-3=-x
d)4(x-7):2+9(x-1):3= 4x-28:2+9x-9:3=4x-14+9x-3=13x-17
Pozdrawiam :)